A worm would stand a poor chance of being fossilized because ________.
a. worms have no hard parts
b. worms have been rare during the geologic past
c. worms contain no carbon-14
a. worms have no hard parts
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A fold is the result of ____________________ deformation. Fill in the blank(s) with the appropriate word(s)
During a ________ year period starting at about 4.5 billion years ago, bits and pieces of metal-rich particles, rocks, and ices accumulated to form the Earth.
A. 10-300 billion B. 3-10 million C. 30-100 million D. 1-10 million
After a major rainstorm in a humid climate and with no overland flow to a stream, why does the stream level rise almost immediately?
a. Groundwater seeps down to raise the water table and forces older groundwater out into the stream. b. The groundwater moves very fast, through porous ground, to the stream. c. The stream rise comes from farther up the drainage basin. d. Actually it doesn’t rise rapidly; it merely seems like it does. e. The groundwater displaces older groundwater in the stream, over the water table.
What happens when the warm air rises at a cold front? a. The warm air expands and warms, producing clear skies
b. It compresses the cold air below, causing rainclouds to form. c. The warm air becomes compressed, causing clouds to form. d. The warm air expands and cools, often causing storm clouds to form. e. It compresses the cold air below, warming it until both temperatures are equal.