Convection in the mantle and pressure of magma on the edge of the plate
Explanation:
Convection currents occur in the mantle because the upper mantle (asthenosphere) is generally cooler than the lower mantle. The convections apply upward pressure on the lower edges on the lithosphere as the melted rocks upwell from below. The lithosphere deflects the convections and as the convections churn clockwise of anticlockwise, they drag the lithosphere with it via friction. This is what is stipulated to cause tectonic plate movements.
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The answer is C and A (I think.)
Gl.
Primary source because it is the original copy of it. Hope this helps and have an awesome rest of your day!
Answer: The correct answer is : (2) all inorganic rocks except igneous rocks are formed from other rocks
Explanation: Igneous rocks are formed by the solidification of magma, the process is slow if it is in the crust and fast if it is on the surface.
Sedimentary rocks are formed on the surface of the earth by processes of erosion and alteration of pre-existing rocks.
Metamorphic rocks have been formed by the evolution of another previous rock due to the environment to which it is subjected that may be hotter, colder or of a different pressure.