Changes in the composition of the atmosphere that cause the Earth’s climate to change are one example of a(n) ____________________ cause of climate change
Fill in the blank with correct word.
ANSWER: ?external
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A(n) ____________ is a substance composed of identical particles called ______________ that cannot be broken into
simpler substances by chemical means. Fill in the blank(s) with the appropriate word(s).
The sea surface: a. is a smooth ellipsoid over the entire ocean
b. has mounts of water over regions of great depth. c. varies only due to waves and tides. d. has mounts of water over undersea mountains or ridges.
One way to maintain soil fertility is through ____.
A. soil salinization B. waterlogging C. slash-and-burn agriculture D. soil conservation E. aquaculture
The first true urban center of the Western Hemisphere was Teotihuacan, a city laid out on a grid aligned with the stars
a. True b. False Indicate whether the statement is true or false