Geologic Time Answers

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Which unit of geologic time is the oldest?

Cenozoic

Mesozoic

Ordovician

Precambrian

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 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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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.

What information does the geologic time scale provide about Earth's history?

Reasons why organisms change into different species

Locations where ancient organisms lived

How plants and animals interact in ecosystems

The sequence and timing of major events in Earth's history

Which period is older than the Triassic period?

Cambrian

Cretaceous

Jurassic

Paleogene

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