Why is plate tectonic movement considered a constructive mechanism while weathering anc erosion are considered destructive mechanisms

Plate Tectonics and Volcanic Activity

A volcano is a feature in Earth's crust where molten rock is squeezed out onto the Earth's surface. Along with molten rock, volcanoes also release gases, ash, and solid rock.

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a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.