Answers Biology VIA Fall 2026 Lstrangesdale.orgGeologic Time

Geologic Time Answers

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Study the geologic time scale.The Eocene period exists in Earth’s history around 34 MYA. What could a scientist do to determine what era the Eocene period belongs to on the geologic time scale?

learn what happened during Precambrian time

study information related to the Cenozoic era

view the timing of events in the Mesozoic era

research events that happened during the Paleozoic era

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Which unit of geologic time is the oldest?

Cenozoic

Mesozoic

Ordovician

Precambrian

Which evidence is most likely used to indicate the beginning of solar system formation?

Materials combined to form a mass.

Materials were pulled together by gravity.

Water condensed and collected to form oceans.

Different species of microorganisms lived on Earth.

What was the significance of collisions of dust, rock, and ice during Earth’s formation?

to modify the density of materials present on Earth

to facilitate heat absorption from the surrounding space

to blow away a strong burst of particles from the first atmosphere

to harden materials to form different parts of Earth’s layers

Which unit of geologic time began 65.5 million years ago and continues to the present?

Cenozoic era

Mesozoic era

Permian period

Precambrian time

Study the graph about oxygen content of Earth’s atmosphere.Which describes oxygen content as Earth evolved over time?

Oxygen levels sharply declined about 400 million years ago.

Oxygen levels stay above 15 percent starting 200 million years ago

Oxygen levels remain below 5 percent starting 1000 million years ago.

Oxygen levels raise significantly between 1000 and 700 million years ago.

Which best explains how gravity contributes to the formation of layers in protoplanets?

Gravity attracts materials and causes compaction, which produces heat and leads to the melting, sinking, and rising of materials.

Gravity causes materials to undergo radioactive decay, which produces heat and leads to the melting, sinking, and rising of materials.

Gravity absorbs heat, which cools materials and causes them to sink and rise.

Gravity releases heat into space, which cools materials and causes them to sink and rise.

How did the formation of the ozone layer contribute to the existence of life on Earth?

It blocked the Sun’s harmful UV rays.

It caused water vapor to cool, condense, and collect.

It released large amounts of oxygen into the air.

It warmed Earth’s surface, preventing materials from freezing.

Study this image of a geologic time scale.

1.6 million years ago

132 million years ago

410 million years ago

520 million years ago

What does the geologic time scale confirm about the Cretaceous period?

It ended during the Cenozoic era.

It ended during the Mesozoic era.

It started before Precambrian time.

It started before the Cambrian period.

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Geologic Time Answers

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