The evidence for the geologic history of plate motions on Earth prior to about 180 million years ago comes entirely from evidence found on continents and not from rocks found in the oceans. Explain why this evidence is restricted to continents
What will be an ideal response?
We have to use evidence that is restricted to continents since there is no oceanic crust older than 180 million years because it has all been subducted.
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Sustainable use of the earth's water resources involves
A. an integrated approach to managing water resources and preventing water pollution throughout each watershed. B. continued subsidizing of the market price of water so that there is fair distribution of water. C. emphasis on waste management over waste prevention. D. discharge of hazardous wastes into deep wells. E. channel pollution into the oceans instead of lakes and rivers.
The relatively flat ground, bounded by bluffs, on either side of the meandering river illustrated below is known as a __________________________. The flat ground is labeled "B".
Fill in the blank(s) with the appropriate word(s).
________ are dangerous, hot masses of ash and gas that travel down the flanks of a volcano
Fill in the blank(s) with correct word
Limestone is most similar to the mineral ________
A) quartz B) gypsum C) halite D) calcite