When did large numbers of fossils first appear in the geologic record?

A. About 500 million years ago
B. About 5 billion years ago
C. About 5000 years ago


Answer: A

Environmental & Atmospheric Sciences

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Which of the following is not a reason that the tracer material was found at varying concentrations?

A) impermeability of materials B) varying pore sizes C) varying circuitous routes of water molecules D) spreading out over a large volume of water

Environmental & Atmospheric Sciences

What is the main geologic feature for which Siccar Point in Scotland is famous?

A. a boundary between steep gray layers below and gently dipping red layer above B. an ancient erosion surface C. an unconformity D. All of these choices are correct. E. None of these choices are correct.

Environmental & Atmospheric Sciences

In the map below, green represents



A) subtropical scrub and woodland.
B) desert.
C) rain forest.
D) grassland.

Environmental & Atmospheric Sciences

Burma recently instituted political reforms including:

A) deposing their king B) a new constitution C) assassinating their military leaders D) releasing foreign hostages

Environmental & Atmospheric Sciences