What is the property of an aquifer that measures its ability to transmit water under a sloping piezometric surface?
Click to see answer
Transmissivity.
Click to see question
What is the property of an aquifer that measures its ability to transmit water under a sloping piezometric surface?
Transmissivity.
Which term refers to the volume of voids in a rock or sediment?
Porosity.
What is a landslide?
A general term that includes many different kinds of mass movement.
What are the two different zones where groundwater occurs in nature?
Unsaturated zone and saturated zone.
What is the term for the ease with which water can move through an aquifer?
Hydraulic conductivity.
What does Darcy's law state about flow rate?
The flow rate Q is proportional to the cross-sectional area A times the hydraulic gradient.
What type of relationship does Darcy's law describe between flow velocity and hydraulic gradient?
Linear.
What happens to the waters off the Pacific coast during La Niña?
They are colder and contain more nutrients than usual.
What is a hazard?
A phenomenon or natural condition with the potential to cause loss of lives, injury, and destruction of properties.
Where are common volcanic eruptions typically found?
Along destructive or convergent plate boundaries.
What is the term for the slope of the piezometric surface in an aquifer?
Hydraulic gradient.
What factors influence the flow rate according to Darcy's law?
The cross-sectional area A and the hydraulic gradient.
What is the unsaturated zone?
The layer where soil and rock are not fully saturated with water.
How can landslides be classified?
Based on the material involved and the type of movement.
What is the unsaturated zone?
The area immediately below the land surface that contains both water and air.
What happens to the waters off the Pacific coast during La Niña?
They become colder and contain more nutrients than usual.
When is a hazard considered a disaster?
When it affects a certain population.
How does La Niña affect marine life?
It supports more marine life and attracts more cold-water species.
What is saltwater intrusion?
The movement of saline water into fresh water aquifers.
What is a rock body that holds water but does not allow easy flow through it?
Aquitard.
What do the volcanoes of the circum-Pacific belt and mid-continental belt represent?
They represent volcanic activity along convergent plate boundaries.
What are hot winds characterized by?
Intense heat and low relative humidity.
What is specific yield?
The ratio of the volume of water that moves from a water-filled rock due to gravity to the total volume of rock.
What is the saturated zone?
The layer where soil and rock are fully saturated with water.
What does hydraulic conductivity represent?
The ability of a geologic structure to transmit water.
Where does flow occur in the unsaturated zone?
Beneath the land surface and above the groundwater table.
What are the three types of earthquakes based on depth of origin?
Normal (shallow), intermediate, and deep-focus earthquakes.
How does La Niña affect marine life?
It supports more marine life due to increased nutrients.
What are the potential consequences of hazards?
Economic disruptions and environmental damage.
What is an Aquitard?
An underground layer that prevents the flow of groundwater from one aquifer to another.
What does Darcy's law describe?
The flow of a fluid through a porous medium.
What are Rossby waves also known as?
Planetary waves.
What causes saltwater intrusion?
Groundwater withdrawal from coastal wells, constructing navigation channels, or oil field canals.
Which cold-water species are attracted to the California coast during La Niña?
Species like squid and salmon.
Which term refers to a rock formation that does not hold water?
Aquifuge.
What is the Simoom wind known for?
Causing dust storms and obstructing visibility.
What is El Niño?
A climate pattern that affects weather significantly.
What causes the volcanoes of the island arcs and festoons off the east coast of Asia?
Subduction of oceanic crust beneath a continental plate.
What is a strong, hot, dust-laden wind in North America called?
Black Roller.
What is the saturated zone?
The area below the surface where water is available to supply wells and springs, correctly referred to as groundwater.
What is specific retention?
The portion of groundwater that remains as a film on particles or in pore spaces.
What is a major feature of the kandic subsurface soil horizon?
Accumulation of low activity clays.
What is the function of the volcanic pipe?
It ejects volcanic materials.
What is the angular velocity of Earth?
7.3 x 10^-5 rad/s.
What is creep in geological terms?
Extremely slow movement that cannot be seen but can be observed indirectly.
What are hot winds characterized by?
Intense heat and low relative humidity.
Who invented the Modified Mercalli Intensity Scale?
Giuseppe Mercalli.
What happens when the wind blows in a curved path?
The centrifugal force acts on the wind, outward from the center of curvature.
What are the trade winds?
Winds that blow out of the subtropical highs toward the equatorial trough in both hemispheres.
What happens to water flow as hydraulic conductivity increases?
It becomes easier for water to flow through the medium.
What is the Benioff zone?
A deep active seismic area in a subduction zone.
What forms the boundary between unsaturated and saturated subsurface flow?
The groundwater table.
What is the significance of the number 87827039266?
It appears to be a numerical sequence or identifier, but without context, its significance is unclear.
What is the depth range for normal or shallow depth earthquakes?
Up to 50 km.
Can the occurrence of natural disasters be controlled by humans?
No, but their impacts can be minimized with better mitigation and management measures.
What is an Aquiclude?
An Aquitard that does not allow groundwater to pass through at all.
Which cold-water species are attracted to the California coast during La Niña?
Squid and salmon.
What does permeability measure in rocks or soil?
The capability to transmit water through its pore spaces.
Who formulated Darcy's law?
Henry Darcy.
What is the term for a rock formation that completely prevents water flow?
Aquiclude.
What is an aquifer?
An underground layer of rocks that can hold water.
In what type of fluids do Rossby waves naturally occur?
Rotating fluids.
What direction do Polar Easterlies blow in the Northern Hemisphere?
From North-East to South-West.
What does the term 'Simoom' mean?
Poison wind.
What does saturated flow refer to in aquifers?
The movement of fluids when all pore spaces are filled with water.
What are the four classifications of geological formations based on hydraulic properties?
Aquifer, aquitard, aquiclude, and aquifuge.
How does recharge occur in the saturated zone?
By percolation of water from the land surface through the unsaturated zone.
What is necessary for liquids or gases to flow through a material?
Voids or interconnected pore spaces.
Which oceanic plate subducts below the Asiatic plate near the Japan Trench?
The Pacific plate.
How does El Niño affect the Pacific jet stream?
It causes the jet stream to move south of its neutral position.
What is the speed of the first object?
~11 m/s
Which direction does the Black Roller wind blow?
From the South-West to the North-West.
How does specific retention change with grain size?
It increases with decreasing grain size.
What forces balance to create the resultant wind?
Pressure gradient force, centrifugal force, and Coriolis force.
Which option indicates organic matter accumulation in soil?
Organic matter Fe and Al oxides accumulation.
What drives atmospheric and oceanic circulations globally?
The difference between incoming and outgoing radiant energy.
What is located at the top of the volcanic pipe?
The vent.
What are some indicators of creep?
Curved tree stems, tilted monuments, distorted fences, and bends in lower parts of telephone or electric poles.
What happens to trade winds during El Niño?
They weaken.
What does the Antarctic plate cover?
The entire lithospheric Antarctica continent.
What is the effect of the Foehn wind?
It melts snow, makes the weather pleasant, and aids in the early ripening of grapes.
What does the Modified Mercalli Intensity Scale measure?
The strength of an earthquake based on observations.
What materials typically make up Aquitards?
Layers of clay or non-porous rocks.
Between which latitudes do the trade winds generally blow?
Between 5° and 25°.
How is the average linear velocity of water flow calculated?
By dividing the volumetric flow rate by the effective porosity.
Where is the Benioff zone typically located?
Beneath volcanic island arcs and continental margins above active subduction zones.
What are surface waves?
Waves that travel on the surface of the Earth.
What is the term for a rock body that can store and transmit significant amounts of water?
Aquifer.
From where do the westerlies blow?
From the horse's latitude (high pressure belt) to the temperate low pressures.
At what depth do intermediate depth earthquakes originate?
Between 50 to 240 km.
What branch of earth sciences is based on Darcy's law?
Hydrogeology.
What causes the formation of the jet stream?
The thermal effect between two air masses of very different temperature and the impact of Coriolis force.
What is the preferred path of moisture movement in the unsaturated zone?
Vertical movement by percolation toward the saturated zone.
What can cause earthquakes in addition to tectonic activity?
Volcanoes.
What does Earth's energy budget describe?
The balance between radiant energy from the sun and energy flowing back to space.
What is the rate of temperature increase with depth in the Earth?
1°C per 32 meters.
Why are aquifers sometimes called sponge rocks?
Because they act like sponges, holding water.
What are tertiary or local winds?
Winds that blow in a particular locality due to local differences in temperature and pressure.
What effect does El Niño have on marine life off the Pacific coast?
It weakens or stops upwelling, reducing nutrient availability.
How does permeability differ from porosity?
Porosity measures how much water can be retained, while permeability measures how easily water can pass through.
What are the two basic types of seismic waves?
Body waves and Surface waves.
How many large plates is the lithosphere divided into?
Six large plates and many smaller plates.
What are ocean ridges and where are they located?
They are linear features situated along constructive plate margins, where two tectonic plates are moving away from each other.
What direction do Polar Easterlies blow in the Southern Hemisphere?
From South-East to North-West.
What is meant by steady-state flow?
A condition where the flow rate remains constant over time.
What is an aquifer?
A geological formation that can store and transmit water.
What causes the formation of Rossby waves in the Earth's ocean and atmosphere?
The rotation of the planet.
From which directions do Simoom winds blow in the Sahara desert?
From North-East and East to the West.
What factors determine permeability in soil?
The size of pore space and interconnectivity of the spaces.
What is the water table?
The level in the saturated zone where hydraulic pressure equals atmospheric pressure.
What is an unconfined aquifer?
An aquifer not overlain by any confining layer but has a confining layer at its bottom.
What weather conditions are experienced in the northern U.S. and Canada during El Niño?
Drier and warmer than usual.
What is the resultant wind called when these forces are balanced?
Gradient wind.
What are Rossby waves?
Large-scale undulations in the westerly winds related to an ideal form of motion.
What is the speed of the second object?
~15 m/s
What type of wind is blowing in Central America?
Monsoon wind.
What is the enlarged form of the volcanic vent called?
Volcanic crater or caldera.
What are hot winds characterized by?
Intense heat and low relative humidity.
What do specific yield and specific retention together equal?
Porosity.
Where is there a surplus of radiant energy?
In the tropics.
What is a characteristic feature of a hardpan in soil?
Strongly cemented by silica.
What is solifluction?
The failure of saturated soil or rock debris in active layers in periglacial regions.
What surrounds the Antarctic plate?
Oceanic lithosphere.
Where does the Foehn wind blow?
Along the Northern slope of the Alps, affecting Switzerland.
How many levels of intensity are on the Modified Mercalli Intensity Scale?
12 increasing levels of intensity.
What is the function of an Aquitard?
To prevent the movement of groundwater between aquifers.
What can lead to floods besides prolonged rainfall?
Brief periods of heavy rain.
How do the speeds of surface waves compare to body waves?
Surface waves travel slower than body waves.
What is a volcano?
A vent or opening through which heated materials are ejected from the Earth's interior.
What causes earthquakes in the Benioff zone?
Differential motion resulting from subduction.
How are the westerlies deflected in the Northern Hemisphere?
To the right, becoming South Westerlies.
What are trade winds known for?
Being constant, steady winds consistent in their direction.
What does the Earth-atmosphere system maintain a balance between?
The energy that reaches Earth from the sun and the energy that flows from Earth back out to space.
What factors influence the flow of water through aquifers?
Porosity and permeability of geological structures.
How do the northern trade winds move due to the Coriolis effect?
They move away from the subtropical high in a clockwise direction out of the northeast.
What effect does El Niño have on ocean water?
Warm water is pushed back east toward the west coast of the Americas.
What is the rate of movement of groundwater described as?
Very slow.
How far can the effects of a volcanic explosion be felt?
In an area 10 to 20 miles around its base.
What portion of the electromagnetic spectrum does most solar energy fall into?
The visible portion.
What is the depth range for deep-focus earthquakes?
From 240 to 725 km.
What is porosity in the context of rocks?
The amount of air space or void between soil particles.
What generates heat deep within the Earth?
The disintegration of radioactive elements.
How does the temperature difference between air masses affect the jet stream?
The greater the temperature difference, the faster the wind blows in the jet stream.
Who developed the Richter scale?
Charles F. Richter.
What generates body waves?
The release of energy at the focus of the earthquake.
What is the largest tectonic plate?
The Pacific plate.
What causes local winds?
Local differences in temperature and pressure.
What is an aquitard?
A geological formation that restricts water flow but can still store some water.
What is the role of trenches in tectonic plate boundaries?
Trenches are situated along convergent or destructive margins, where the oceanic lithosphere is destroyed and recycled back into the Earth.
What is normally brought to the surface by upwelling?
Cold and nutrient-rich water.
What is the permeability of soil related to?
The gaps or voids present between soil particles.
What is a tectonic plate?
A gigantic, irregularly shaped rigid slab of rock that moves slowly over the asthenosphere.
How can water be extracted from an aquifer?
By drilling a well and using water pumps or manually with a rope and bucket.
What are the main characteristics of Polar Easterlies?
Extreme coldness, stability, and low moisture content.
What is the effect of Harmattan on the weather in the Western coast of Africa?
The weather suddenly becomes dry and pleasant.
What is flow in granular media?
The movement of fluids through materials composed of grains, such as sand or gravel.
What is seismology?
The science that studies various aspects of seismic waves generated during earthquakes.
What geological feature is created by the subduction of a denser oceanic plate?
Trenches.
When does the gradient wind occur?
During cyclonic or anticyclonic movement of air around low and high pressure zones.
What is the top of the saturated surface in an unconfined aquifer called?
The water table.
What is the Ghyben-Herzberg relation?
The hydrostatic equilibrium relationship between columns of fresh and high density seawater.
What plays a main role in determining permeability?
The shape and arrangement of soil grains.
What are polar easterlies?
Dry, cold prevailing winds that blow from polar highs towards subpolar lows.
What instrument is used to detect and record vibrations produced by earthquakes?
Seismographs.
What causes the existence of Rossby waves?
The rotation and spherical shape of the Earth.
Where is the Cocos Plate located?
Between Central America and the Pacific Plate.
What causes saltwater intrusion in coastal aquifers?
The pumping of groundwater and the higher density of seawater compared to freshwater.
What happens to hydraulic pressure below the water table?
It increases with increasing depth.
What types of materials are included in volcanic materials?
Lavas, volcanic dusts and ashes, fragment materials.
What is the Loo?
A hot and dry wind blowing in Northern India and Pakistan from the North-West and West to the East.
What happens at high latitudes regarding radiant energy?
More energy is emitted than absorbed.
What type of boundary surrounds the Antarctic plate?
Spreading boundary.
At what slope inclination can solifluction occur?
At slopes less than 5 degrees.
What is the strong and rapidly moving circumpolar upper air westerly circulation called?
Jet streams.
What weather conditions are observed in the U.S. Gulf Coast and Southeast during El Niño?
Wetter than usual with increased flooding.
What is the frictional force?
The drag near the surface that acts opposite to the direction of motion.
What type of clays accumulate in the kandic subsurface soil horizon?
Low activity clays.
What is the range of the Modified Mercalli Intensity Scale?
From imperceptible shaking to catastrophic destruction.
What is the speed of the third object?
~26 m/s
What is the first assumption of Darcy's law?
The soil is saturated.
What is an Aquifuge?
Another term for an Aquiclude, which does not allow groundwater to pass.
What happens when there is a sudden burst of heavy rain?
Rainwater cannot infiltrate fast enough and enters the river via surface runoff.
What is the direction of vibrations in S-waves?
Perpendicular to the wave direction in the vertical plane confined to the Earth's surface.
In what state does groundwater hydrology operate?
In the natural state.
What materials are typically ejected from a volcano?
Gases, water, liquid lava, and fragments of rocks.
What type of winds are found in the Tarim basin in Central Asia?
Dust-laden fast-blowing winds blowing towards the North-East.
Where are trade winds most consistent?
When they cross the eastern sides of the oceans near the eastern portion of the subtropical high.
What can cause changes in the Earth-atmosphere system?
Natural phenomena like volcanoes or human activities.
How do the southern trade winds diverge?
They diverge out of the subtropical high toward the equatorial trough from the southeast in a counterclockwise direction.
How are the westerlies deflected in the Southern Hemisphere?
To the left, becoming North Westerlies.
What defines cold winds?
Winds that induce a cold wave due to their temperature being below the freezing point.
What causes the origin of magma?
Lowering of melting point due to reduction in pressure from overlying load.
How do the effects of volcanic earthquakes compare to tectonic earthquakes?
Volcanic earthquakes affect a smaller area than tectonic earthquakes.
What happens at the zones where one tectonic plate goes down under another?
They are sites of most of the world’s active and explosive volcanoes.
What does El Niño mean in Spanish?
Little Boy.
What percentage of the sun’s incoming energy is reflected back to space?
About 30 percent.
What causes the slow rate of movement of groundwater?
The tremendous amount of friction produced by water moving through spaces between particles of sand and gravel.
How is porosity determined?
By studying the shape and arrangement of soil particles.
What is an aquiclude?
A geological formation that does not allow water to pass through.
In what year was the Richter scale developed?
