Which statement best describes the formation of metamorphic rocks? magma cools and crystallizes slowly beneath earth’s surface. liquid lava erupts from a volcano and cools quickly at earth’s surface. sand and gravel are deposited at the mouth of a river and, over time, form layers that solidify into rock. ancient sandstone beaches become buried deep beneath earth’s surface, where they are exposed to extreme heat and pressure.

Ancient sandstone beaches become buried deep beneath Earth’s surface, where they are exposed to extreme heat and pressure.

Ancient sandstone beaches become buried deep beneath Earth’s surface, where they are exposed to extreme heat and pressure is the correct answer.

Explanation:

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.