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

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

Which of the following denotes the divisions of the geologic time scale in correct order of decreasing lengths of time beginning with the longest time interval and ending with the shortest?

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

Hurricanes are said to have a steep pressure gradient, and as you move toward the center of the storm, ________.

Proxy data for detecting climate change comes from ________.

________ is(are) produced by anaerobic bacteria.

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?

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