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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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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 unit of geologic time is the oldest?

Cenozoic

Mesozoic

Ordovician

Precambrian

What is the purpose of a geological time scale ?

It used to predict natural disaters throughout Earth’s history.

It is used to present the correct sequence of events in the Earth’s history.

It is used to determine the absolute dates in years for different periods.

It used to create a naming system for flora and fauna.

Study the image about geologic time.

Quaternary

Neogene

Paleogene

Cenozoic

Which best explains how the collisions of materials in space contribute to the formation of layers in protoplanets?

The materials undergo decay when they collide, which results in the heating and subsequent melting and rising of materials.

The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.

The materials undergo decay when they collide, which results in the cooling and subsequent hardening and sinking of materials.

The collisions absorb heat, which results in the cooling and subsequent hardening and rising of materials.

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

Cenozoic era

Mesozoic era

Permian period

Precambrian time

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.

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

The table shows index fossils.

Life forms existed during the Cambrian period.

Similar fossil species formed after the Devonian period.

This fossil species first appeared during the Cenozoic era.

Different life forms were surviving during Precambrian time.

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.

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.

Which period is older than the Triassic period?

Cambrian

Cretaceous

Jurassic

Paleogene

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

Why is radioactive dating important when approximating the age of Earth?

Scientists can identify different life forms using index fossil records.

Scientists can examine how temperature changes within Earth’s interior.

Scientists can determine the order of when rocks formed on Earth.

Scientists can analyze changes in chemical concentration of atmospheric gases.

Study the image.8307-06-05-10.jpg

Mosses appeared after the first flowering plants.

Aquatic Flora appeared many years ago.

The first flowering plants appeared around 240 million years ago.

The first flowering plants were introduced toward the end of the Mesozoic era.

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.

Which evidence supports the claim that Earth’s continents formed during Precambrian time?

Compaction caused rock to cool and rise to form pieces of crust.

Earth collided with a large object and threw material onto Earth’s surface.

Collisions with comets added land masses to Earth’s surface.

Earth’s surface cooled, causing rocks to cool and harden.

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Geologic Time Answers

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