Question

during the process of mountain building,
○a. material from the earths interior is often returned to the surface.
○b. material from the earths surface is often broken down by crystalization,
○c. weathering and erosion help to generate igneous rock formations.

Explanation:

• Option A: During mountain - building (orogeny), magma (material from the Earth's interior) can rise and reach the surface. For example, in volcanic mountain - building processes, magma erupts onto the surface.
• Option B: Crystallization is a process related to the formation of minerals from magma or solutions, not the breakdown of surface materials. Weathering (not crystallization) breaks down surface materials.
• Option C: Weathering and erosion are processes that break down and remove rocks, not generate igneous rock formations. Igneous rocks form from the cooling and solidification of magma or lava.

Answer:

A. material from the Earth’s interior is often returned to the surface.