What is the primary component of Earth’s current atmosphere?
a. carbon dioxide
b. oxygen
c. water vapor
d. nitrogen
e. argon
d
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Although traditional agriculture is common in many parts of the world, the United States primarily uses ____________________ agriculture for food production.
Fill in the blank(s) with the appropriate word(s).
The increase in atmospheric oxygen during the Proterozoic was caused by ____
a. a decrease in worldwide volcanism. b. a decrease in the size of oceans.
c. photosynthesis by cyanobacteria. d. the appearance of land plants. e. formation of banded iron formations
A ____ fault would be expected at a divergent boundary
a. ?reverse b. ?thrust c. ?blind thrust d. ?strike-slip e. ?normal
Since the earth turns ________ the tide wave tends to move ________ around Earth.
A. eastward; eastward B. northward; southward C. westward; eastward D. westward; westward E. eastward; westward