Exfoliation joints result from compression. Methyl hydrates occur as gas-rich crystalline ices in the Earth's deep mantle. Nuclear power and coal are the most inexpensive sources of energy used to make electricity. Solar, geothermal, biomass, and wind remain as the most expensive forms of energy. Which states has the largest reserves of coal.
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Three products from sewage plants are 17. Common geologic traps for petroleum reserves include 24.