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The two main sources of human-generated aerosols are ________ and ________.

________ is(are) produced by anaerobic bacteria.

All geologic time prior to the beginning of the Paleozoic era is termed the ________.

Consider the names of the eras in the geologic time scale. What is meant by “zoic”?

What type of fossilization is best at preserving delicate animal forms?

________ is an erosional contact between tilted, older strata below and horizontal, younger strata above.

________ is(are) produced by anaerobic bacteria.

________ is(are) produced by anaerobic bacteria.

All of the following statements concerning dry lands are true EXCEPT ________.

The time period of “ancient life” is the ________ era.