Coral bleaching occurs when ________.
A. when too much sunlight is shining on the coral.
B. ocean temperatures are too warm.
C. during low tide when coral is exposed to the air.
D. when ocean temperatures are too cool.
Answer: B
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Compared with the resultant of a pair of equal-length vectors at right angles to each other, the resultant when the angle is less than 90° is
A. less. B. greater. C. the same. D. need more information
Match the rock with the correct igneous composition. (Some choices will be used more than once.)
A) Felsic B) Intermediate C) Mafic 1) Rhyolite 2) Pumice 3) Gabbro 4) Diorite 5) Andesite 6) Obsidian
The most abundant gas in Earth's lower atmosphere is ____________________
Fill in the blank(s) with correct word
Ninety-seven percent of the air in the atmosphere is concentrated in the first 25 km
Indicate whether the statement is true or false