Geologic Time Answers

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

Cenozoic era

Mesozoic era

Permian period

Precambrian time

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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.

What caused Earth's oceans to begin forming during Precambrian Time?

Earth's temperatures increased, causing evaporation

Comets added frozen water directly to the oceans

Oxygen levels increased due to photosynthesis

Water vapor condensed as Earth's surface cooled

Which process contributes to the formation of layers in protoplanets when unstable elements release particles and energy?

compaction

evaporation

radioactive decay

collision of space materials

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