Environment, the thin layer of life and life supports called the biosphere, including the earth's air, soil, water, and living organisms. Constituents of the Environment Throughout its long history, the earth has changed slowly. Continental drift separated landmasses, oceans invaded and retreated from the land, and mountains rose and were worn down, depositing sediments along the edges of seas. Climates warmed and cooled, and life forms appeared and disappeared as the environment changed. The last …
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