C898 Earth Science: Content Knowledge
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Free C898 Earth Science: Content Knowledge Questions
The appropriate number of significant figures in the result of 25.0 × 4.18 is:
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2
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3
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4
-
5
Explanation
When multiplying numbers, the result must have the same number of significant figures as the factor
with the fewest significant figures. In this case, 25.0 has three significant figures, and 4.18 also has three.
Therefore, the product should be reported with three significant figures. The raw result of 25.0 × 4.18 is
104.5, which when rounded to three significant figures becomes 105.
Correct Answer:
3
The Bowen reaction series predicts the order of:
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Sediment deposition
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Mineral crystallization in magma
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Metamorphic grade
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Fossil preservation
Explanation
The Bowen reaction series describes the sequence in which minerals crystallize from cooling magma
based on their chemical composition and melting points. Minerals with higher melting points, such as
olivine and pyroxene, crystallize first, while lower-melting minerals like quartz and muscovite crystallize
later. This series helps geologists understand the formation of igneous rocks and the relationships between
mineral composition and cooling history in magmatic systems.
Correct Answer:
Mineral crystallization in magma
An unconformity in a rock sequence represents:
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A period of deposition
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A period of erosion or non-deposition
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Volcanic activity
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Metamorphism
Explanation
An unconformity in a rock sequence signifies a gap in the geologic record caused by a period of erosion
or lack of deposition. During this time, previously formed layers may have been eroded away before new
sediments were deposited, creating a boundary between older and younger rocks. Unconformities are
important because they reveal episodes of crustal movement, uplift, or sea-level change that interrupt the
continuous deposition of sediments.
Correct Answer:
A period of erosion or non-deposition
Index fossils are useful for correlation because they:
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Lived over wide areas for short geologic time periods
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Are found only in igneous rocks
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Are always marine
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Contain radioactive isotopes
Explanation
Index fossils are species that existed for a relatively short geologic time but were widely distributed
geographically. Their presence in rock layers allows geologists to correlate the age of rocks from different
locations, providing a valuable tool for dating and mapping strata. Because they lived for a limited time,
they offer precise time markers, making it possible to compare the relative ages of rock formations across
vast areas.
Correct Answer:
Lived over wide areas for short geologic time periods
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
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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
A neutron star is the collapsed core of a star that originally had a mass of approximately:
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1–3 solar masses
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3–8 solar masses
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8–20 solar masses
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More than 20 solar masses
Explanation
A neutron star forms from the collapsed core of a massive star that originally had a mass of
approximately 8–20 solar masses. After the star undergoes a supernova explosion, the core compresses
into an incredibly dense object composed mostly of neutrons, typically with a radius of about 10–15
kilometers but containing more mass than the Sun. Neutron stars exhibit extreme gravity, rapid rotation,
and strong magnetic fields, often observable as pulsars.
Correct Answer:
8–20 solar masses
The Chandrasekhar limit refers to the maximum mass of a stable:
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White dwarf
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Neutron star
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Main-sequence star
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Red giant
Explanation
The Chandrasekhar limit is the maximum mass (~1.4 solar masses) that a white dwarf can have while
remaining stable against gravitational collapse. If a white dwarf exceeds this limit, electron degeneracy
pressure can no longer support it, potentially leading to a type Ia supernova or collapse into a neutron star.
This concept is fundamental in understanding the life cycles of medium-mass stars and the physics
governing stellar remnants.
Correct Answer:
White dwarf
The Coriolis effect causes moving air in the Northern Hemisphere to deflect:
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To the left
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To the right
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Straight
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Upward
Explanation
The Coriolis effect results from Earth’s rotation, causing moving air and water to be deflected relative to
the surface. In the Northern Hemisphere, this deflection is to the right of the direction of motion. This
effect influences wind patterns, ocean currents, and the rotation of large weather systems such as cyclones
and anticyclones. The Coriolis effect does not generate motion itself but modifies the path of moving
objects over long distances.
Correct Answer:
To the right
The boundary where two tectonic plates slide past each other horizontally is called a:
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Divergent boundary
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Convergent boundary
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Transform boundary
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Subduction zone
Explanation
A transform boundary occurs where two tectonic plates slide past each other horizontally without
significant vertical movement. This motion often results in intense friction and stress along the fault lines,
leading to frequent earthquakes. Unlike divergent boundaries where plates move apart or convergent
boundaries where they collide, transform boundaries primarily involve lateral displacement. The energy
released along these boundaries is a major source of seismic activity.
Correct Answer:
Transform boundary
The asthenosphere is best described as:
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Rigid and brittle
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Solid but capable of flow (plastic)
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Completely molten
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Composed of continental crust
Explanation
The asthenosphere is a layer of the upper mantle located below the lithosphere. It is composed of solid
rock that behaves plastically, meaning it can slowly flow under pressure over long periods. This plasticity
allows the rigid lithospheric plates to move and shift across its surface, driving plate tectonic activity.
Although the asthenosphere is partially molten in some areas, it is not completely liquid but rather a soft,
deformable solid capable of convection currents.
Correct Answer:
Solid but capable of flow (plastic)
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