Which of the following is correct in regards to the geologic time scale?

A) An epoch is composed of one or more periods.
B) The largest defined unit is an eon or, according to some, a supereon.
C) An era is the smallest unit of geologic time.
D) Every period is composed of 2 epochs.


B

Environmental & Atmospheric Sciences

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The first domestication of crops and animals occurred about ________ years ago

A) 5 million B) 2 million C) 500,000 D) 100,000 E) 10,000

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In addition to fossils, what are other types of evidence for evolutionary theory?

Environmental & Atmospheric Sciences

Which property most inhibits convection?

A) elasticity B) viscosity C) density D) rigidity

Environmental & Atmospheric Sciences