Geologic Time Answers
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Which unit of geologic time began 65.5 million years ago and continues to the present?
A
Cenozoic eraB
Mesozoic eraC
Permian periodD
Precambrian time22
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Study this image of a geologic time scale.
A
1.6 million years agoB
132 million years agoC
410 million years agoD
520 million years ago23
How did the formation of the ozone layer contribute to the existence of life on Earth?
A
It blocked the Sun’s harmful UV rays.B
It caused water vapor to cool, condense, and collect.C
It released large amounts of oxygen into the air.D
It warmed Earth’s surface, preventing materials from freezing.Did you find these answers helpful?
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