What was the source(s) of the heat that made the early Earth much hotter than it is today?
What will be an ideal response?
Collisional heating and radioactive decay (including short-lived types).
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All of the following are considered to be biological hazards except
a. viruses b. parasites c. diet d. bacteria e. fungi
The most important current for promoting water exchange among all three oceans is the: a. Gulf Stream
b. South Pacific Gyre. c. Arctic Convergence. d. Antarctic Circumpolar Current.
How is the geologic time scale sub-divided into smaller units?
A. Based on equal time intervals B. Based on the fossil record C. Based on major events in Earth history
Gas bubbles decrease in number and volume as magma keeps rising upward to lower pressures, helping to propel magma upward through fractures or pipes toward an eruption.
Answer the following statement true (T) or false (F)