Plate Tectonics.
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Broadly, the ocean floors (below the accumulated sediment) are basalt while the continents below their variegated "cover rocks" are huge, much thicker, rafts of granite.
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The lithosphere is broken into separate sections called tectonic plates. These plates float on the semi-fluid asthenosphere beneath them and interact at their boundaries through processes like subduction, spreading, and collision.
Plate tectonics.
The theory of plate tectonics states that Earth's crust and upper mantle are divided into several large plates that float on the semi-fluid asthenosphere. These plates move slowly relative to each other, resulting in processes such as earthquakes, volcanic activity, and mountain building.
The theory of plate tectonics states that the Earth's surface is divided into several large and slow-moving plates that float on the semi-fluid asthenosphere beneath them. These plates interact at their boundaries, leading to processes such as earthquakes, volcanic activity, and mountain formation. The movement of these plates has shaped the Earth's surface over millions of years.
The theory of plate tectonics states that the Earth's lithosphere is divided into several large plates that move over the semi-fluid asthenosphere of the mantle. The motion of these plates is primarily driven by convection currents in the mantle.