How were the lunar maria formed?
What will be an ideal response?
The maria are ancient lava flows that have apparently covered older, cratered lowlands.
Although most of the Moon cooled rapidly after its formation, radioactive decay heated material deep in the crust, and part of it melted. Molten rock followed the cracks up to the surface and flooded the giant basins with successive lava flows of dark basalts from about 4 billion to about 2 billion years ago. This formed the maria.
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If the temperature of a room is 60
then what is the temperature of the room in Celsius?
A. 26.2
B. 24.0
C. 21.4
D. 19.7
E. 15.6
The general formula R-NH2 is that of
a. an amine. b. an alkyl halide. c. an alcohol. d. none of these
Observed temperature fluctuations in the Cosmic Microwave Background Radiation are
A) millions of kelvins. B) hundreds of kelvins. C) a few kelvins. D) tens of millionths of a kelvin. E) immeasurably small.
Why has Mercury traditionally been such a hard planet to observe and study?
What will be an ideal response?