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Approximately 2.2 billion years ago, which gas was first added in large amounts to Earth’s atmosphere from life-forms that evolved in the oceans?
less than 1.0%
Cambrian
4
4.6 × 10^9 years
oxygen
southward, resulting in a colder climate
fossil evidence
B
What percentage of Earth's history represents human existence?
less than 1.0%
Cambrian
4
4.6 × 10^9 years
oxygen
southward, resulting in a colder climate
fossil evidence
B
Trilobite fossils were recently discovered in Himalayan Mountain bedrock. During which geologic period could these organisms have lived?
less than 1.0%
Cambrian
4
4.6 × 10^9 years
oxygen
southward, resulting in a colder climate
fossil evidence
B
Which graph shows the relative duration of geologic time for the Precambrian, Paleozoic, Mesozoic, and Cenozoic time intervals?
less than 1.0%
Cambrian
4
4.6 × 10^9 years
oxygen
southward, resulting in a colder climate
fossil evidence
B
What is the estimated age of Earth?
less than 1.0%
Cambrian
4
4.6 × 10^9 years
oxygen
southward, resulting in a colder climate
fossil evidence
B
Antarctica's location and climate changed over the last 200 million years because Antarctica moved
less than 1.0%
Cambrian
4
4.6 × 10^9 years
oxygen
southward, resulting in a colder climate
fossil evidence
B
Geologists have subdivided geologic time into units based on
less than 1.0%
Cambrian
4
4.6 × 10^9 years
oxygen
southward, resulting in a colder climate
fossil evidence
B
Which number best represents when humans are inferred to have first appeared on Earth?
less than 1.0%
Cambrian
4
4.6 × 10^9 years
oxygen
southward, resulting in a colder climate
fossil evidence
B
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