In a graded bed, the particle size
A. decreases upward
B. decreases downward
C. stays the same
D. increases in the direction of the current
Answer: A
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When a species disappears from the earth, it is said to be biologically extinct.
Answer the following statement true (T) or false (F)
The Pacific islands in the 1800s were of interest primarily to
A. the Polynesian empire builders. B. naturalists like Darwin. C. pirates. D. whalers and missionaries.
Which continent has more than 12,000 cubic kilometers of water available per year?
-Australia -North America -Asia -Europe -Africa -South America
The lithosphere is composed of the ________ and the rigid part of the ________
A) outer core; inner core B) mantle; outer core C) crust; lower mantle D) crust; upper mantle