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All Answers (14) 1  Movement of plate tectonics causes a change in the ocean currents and in turn generates more heat. Shifting of these tectonic plates result in the creation of the volcanic eruptions increases the degree of carbon dioxide (CO2) and sulphur dioxide (SO2) in the atmosphere that also leads to a rise in the temperature levels.
The gases evolved during the melting of Earth's mantle have a large effect on the composition and size of Earth's atmosphere. Uppermost mantle. A thin crust, the lower part of the lithosphere, surrounds the mantle and is about 5 to 75 km thick. There are two main zones in the upper mantle. The uppermost mantle plus overlying crust are relatively rigid and form the lithosphere, an irregular layer with a maximum thickness of perhaps 200 km, of which the uppermost mantle is 120 to 50 km thick.