Radioactive decay within the Earth produces heat; the other form of heat produced by the Earth comes from
A. solar radiation trapped in the rock on the Earth's surface.
B. heat produced by air as it moves across the oceans.
C. heat trapped when the Earth was formed.
Answer: C
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Much of this biome has disappeared from Earth because it has been converted to grazing lands for cattle and croplands
a. temperate grassland b. temperate forest c. tropical grassland d. cold grassland e. cold desert
An example of a rock/sediment type that could be an effective aquiclude is:
a. quartz sandstone. b. fractured granite. c. gravel. d. shale. e. graywacke.
How do wave trains travel? How do they interact with each other?
The spectra of most stars are dark-line spectra because ________
A) elements in the Sun's outer atmosphere absorb in these dark-line bands, blocking the radiation in those bands B) electrons decaying to a lower energy state emit a photon at a fixed energy, leaving dark bands between the emissions C) elements in the Sun's outer atmosphere emit radiation between these dark bands D) elements in the earth's atmosphere absorb in these dark-line bands, blocking out the frequencies in the dark bands