C898 Earth Science: Content Knowledge
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Free C898 Earth Science: Content Knowledge Questions
The majority of Earth’s freshwater is stored in:
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Rivers and lakes
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Atmosphere
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Groundwater
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Ice caps and glaciers
Explanation
The majority of Earth’s freshwater is stored in ice caps and glaciers, which account for approximately
68–70% of all freshwater. These large, frozen reservoirs are primarily located in polar regions such as
Antarctica and Greenland. While groundwater also represents a significant portion of freshwater, rivers
and lakes contain only a small fraction. The storage of freshwater in ice caps and glaciers is critical for
regulating global sea levels and providing seasonal meltwater for ecosystems and human use.
Correct Answer:
Ice caps and glaciers
Porosity is best defined as the:
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Ability of rock to transmit water
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Percentage of pore space in a material
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Rate of groundwater flow
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Depth of the water table
Explanation
Porosity refers to the percentage of a rock or sediment's total volume that is made up of pore spaces or
voids. These spaces can store water, oil, or gas, making porosity a key property in hydrogeology and
petroleum geology. Porosity is distinct from permeability, which measures how easily fluids can flow
through the material. High porosity indicates a greater capacity to hold fluids, while the arrangement, size,
and connectivity of pores influence the movement of groundwater.
Correct Answer:
Percentage of pore space in a material
Water is most dense at:
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0 °C
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4 °C
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100 °C
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–10 °C
Explanation
Water reaches its maximum density at 4 °C. At temperatures above or below this point, water molecules
expand slightly, decreasing density. This density anomaly is crucial for aquatic life because it allows ice
to float on water, insulating the liquid beneath and maintaining a stable environment for organisms during
cold conditions. The unusual behavior of water compared to most substances, which continue to become
denser as they cool, is due to the hydrogen bonding between molecules.
Correct Answer:
4 °C
Which process is primarily responsible for the formation of the Hawaiian Islands?
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Subduction
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Sea-floor spreading
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Hot spot volcanism
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Continental collision
Explanation
The Hawaiian Islands were formed by hot spot volcanism, a process where a stationary plume of hot
mantle material rises toward the surface, melting the overlying crust and creating volcanic islands. As the
Pacific Plate moves northwest over this fixed hot spot, new volcanoes form while older ones become
extinct and eventually erode into seamounts. This explains the age progression of the Hawaiian island
chain, with the youngest islands located in the southeast and the oldest in the northwest.
Correct Answer:
Hot spot volcanism
The epicenter of an earthquake is located directly above the:
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Focus
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Fault scarp
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Seismic gap
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Hypocenter (same as focus)
Explanation
The epicenter of an earthquake is the point on Earth’s surface located directly above the focus, also called
the hypocenter, where the earthquake originates. Seismic waves radiate outward from the focus, and the
epicenter is typically where the strongest ground shaking is felt. Identifying the epicenter helps scientists
determine the affected regions and understand the earthquake’s distribution of energy.
Correct Answer:
Focus
The only planet in the solar system with a day longer than its year is:
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Mercury
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Venus
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Mars
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Pluto
Explanation
Venus is the only planet in the solar system whose rotation period (a day) is longer than its orbital period
(a year). Venus takes about 243 Earth days to complete one rotation on its axis, while it completes an orbit
around the Sun in approximately 225 Earth days. This slow retrograde rotation results in a very long solar
day and unique atmospheric and surface conditions, including extreme temperatures and a dense,
greenhouse gas-rich atmosphere.
Correct Answer:
Venus
An artesian well flows naturally because the aquifer is:
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Confined and under pressure
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Unconfined
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Above the water table
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Contaminated
Explanation
An artesian well flows naturally because it taps into a confined aquifer that is under pressure. Confined
aquifers are sandwiched between impermeable layers of rock or clay, which trap water and create
pressure. When a well penetrates such an aquifer, the internal pressure forces water to rise above the level
of the aquifer without the need for pumping. This phenomenon is a result of the hydraulic head difference
between the recharge area and the well location.
Correct Answer:
Confined and under pressure
The Kepler mission was designed primarily to detect:
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Extrasolar planets via transit method
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Gamma-ray bursts
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Dark matter
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Gravitational waves
Explanation
The Kepler mission was launched to detect extrasolar planets (exoplanets) using the transit method. This
method observes periodic dimming of a star’s light when a planet passes in front of it, allowing
astronomers to determine the planet’s size, orbital period, and sometimes atmospheric properties. Kepler’s
precise photometric measurements led to the discovery of thousands of exoplanet candidates, significantly
expanding our understanding of planetary systems beyond the solar system.
Correct Answer:
Extrasolar planets via transit method
Hubble’s law states that galaxies are receding from us with a velocity proportional to their:
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Mass
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Distance
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Temperature
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Age
Explanation
Hubble’s law states that the velocity at which a galaxy is moving away from an observer is directly
proportional to its distance from that observer. This relationship provides strong evidence for the
expansion of the universe, indicating that space itself is stretching over time. The law is expressed
mathematically as (v = H_0 * d), where (v) is the recessional velocity, (d) is the distance, and (H_0) is
Hubble’s constant.
Correct Answer:
Distance
The primary reason Earth has seasons is its:
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23.5° axial tilt relative to its orbital plane
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Elliptical orbit around the Sun
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Distance from the Sun in winter
-
Precession of the equinoxes
Explanation
Earth experiences seasons primarily due to its 23.5° axial tilt relative to its orbital plane. This tilt causes
different parts of the planet to receive varying amounts of solar energy throughout the year. During
summer in a given hemisphere, that hemisphere is tilted toward the Sun, resulting in longer days and more
direct sunlight, while during winter it is tilted away, producing shorter days and less direct sunlight. The
elliptical shape of Earth’s orbit has minimal effect on seasonal changes compared to axial tilt.
Correct Answer:
23.5° axial tilt relative to its orbital plane
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