Igneous rocks deposited on the surface and then cooled are known as ________
A) clastic
B) core
C) intrusive
D) extrusive
E) detrital
Answer: D
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The Earth's climate cycles between warmer and colder periods
Indicate whether the statement is true or false
Within the zone of saturation, groundwater flows from the region of ____________________ pressure
to the region of ____________________ pressure. Fill in the blank(s) with the appropriate word(s).
The two main geographic areas in which the tundra biome exists are
A) in the coastal northern margins of the Northern Hemisphere and on the tops of the highest mountains. B) in the coastal northern margins of the Southern Hemisphere and on the tops of the highest mountains. C) in Antarctica and Greenland. D) in central Canada and inland Siberia.
Which of the following forms different layers from season to season and can be used to determine how many years the layers represent?
A. varves B. tree rings C. layers in ice cores D. All of these choices are correct.