There are three kinds of rock: igneous, sedimentary, and metamorphic. Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water.
From nitrogenous bacteria found on the surface of leguminous plants. They convert nitrogen into nitrates which is absorbed by plants
Most deforest trees for agricultural land.
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