Geologic Time Answers

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1
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Which event happened first in Earth’s evolution on the geologic time scale?

A
Energy from collisions melted materials that became Earth’s core.
B
The Sun released a strong burst that destroyed the first atmosphere.
C
A ball of dust, ice, and rock was pulled together by gravity.
D
Dense materials hardened to form the crust and mantle.
2
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Which events contributed to life evolving on Earth? Check all that apply.Organisms began to photosynthesize.The surface cooled, and water condensed.Volcanoes added carbon dioxide to the atmosphere.Ozone formed and blocked ultraviolet rays from the Sun.Comets crashed into Earth, releasing water.

A
Organisms began to photosynthesize.
B
The surface cooled, and water condensed.
C
Volcanoes added carbon dioxide to the atmosphere.
D
Ozone formed and blocked ultraviolet rays from the Sun.
E
Comets crashed into Earth, releasing water.

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Geologic Time Answers — MOHEGAN - EARTH SCIENCE A