Geologic Time Answers
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Which best explains how gravity contributes to the formation of layers in protoplanets?
A
Gravity attracts materials and causes compaction, which produces heat and leads to the melting, sinking, and rising of materials.B
Gravity causes materials to undergo radioactive decay, which produces heat and leads to the melting, sinking, and rising of materials.C
Gravity absorbs heat, which cools materials and causes them to sink and rise.D
Gravity releases heat into space, which cools materials and causes them to sink and rise.2
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Which period is older than the Triassic period?
A
CambrianB
CretaceousC
JurassicD
Paleogene3
Why is radioactive dating important when approximating the age of Earth?
A
Scientists can identify different life forms using index fossil records.B
Scientists can examine how temperature changes within Earth’s interior.C
Scientists can determine the order of when rocks formed on Earth.D
Scientists can analyze changes in chemical concentration of atmospheric gases.4
What was the significance of collisions of dust, rock, and ice during Earth’s formation?
A
to modify the density of materials present on EarthB
to facilitate heat absorption from the surrounding spaceC
to blow away a strong burst of particles from the first atmosphereD
to harden materials to form different parts of Earth’s layers5
The table shows index fossils.
A
Life forms existed during the Cambrian period.B
Similar fossil species formed after the Devonian period.C
This fossil species first appeared during the Cenozoic era.D
Different life forms were surviving during Precambrian time.6
What information does the geologic time scale provide about Earth's history?
A
Reasons why organisms change into different speciesB
Locations where ancient organisms livedC
How plants and animals interact in ecosystemsD
The sequence and timing of major events in Earth's history7
Which unit of geologic time is the oldest?
A
CenozoicB
MesozoicC
OrdovicianD
Precambrian8
Which event in Earth’s history most directly allowed life to exist on land?
A
Earth’s temperatures increased, causing widespread evaporation.B
Earth collided with a large object, forming the moon.C
Single-celled organisms released oxygen into the air when they photosynthesized.D
Single-celled organisms absorbed harmful gases from the air when they first formed.9
Which led to the formation of oceans after water on Earth’s surface evaporated?
A
The sun released a strong burst of water vapor.B
As Earth cooled, water in the atmosphere condensed.C
Materials collided due to strong gravitational forces.D
The ozone layer formed to protect against harmful UV ray exposure.10
Which best explains how the collisions of materials in space contribute to the formation of layers in protoplanets?
A
The materials undergo decay when they collide, which results in the heating and subsequent melting and rising of materials.B
The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.C
The materials undergo decay when they collide, which results in the cooling and subsequent hardening and sinking of materials.D
The collisions absorb heat, which results in the cooling and subsequent hardening and rising of materials.Did you find these answers helpful?
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