Natural gas accounts for the most used source of energy in the usa. natural gas is used in homes, and to generate electricity. according to research, 37 percent of energy consumption in the USA is from this form of primary energy.
it is followed by oil,coal and nuclear energy. Wood is a rare source of energy in the country. Renewable sources of energy include solar and wind energy.
Comets are cosmic snowballs of frozen gases, rock and dirt that orbit the Sun. once frozen, they're the dimensions of a small city. when a comet's orbit brings it about to the Sun, it heats up and spews dirt and gases into an enormous glowing head larger than most planets.
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Answer:
divergent boundary
Explanation:
The South American and African plates moved apart as a divergent boundary formed between them and an ocean basin formed and spread.
Answer:
Step 1
Explanation:
Rocks that forms metamorphic rocks are not pushed to the earth surface. On the surface, the pressure and temperature conditions are not high enough to cause any metamorphic transformation in a rock.
Rocks must subside into deeper levels of the crust where mineral changes occur and hence new rocks called metamorphic rocks.
