question 3 of 10\nunder which condition below would you expect a coarse - grained intrusive rock like…

question 3 of 10\nunder which condition below would you expect a coarse - grained intrusive rock like diorite to form?\na. slow cooling at the upper mantle\nb. lava slowly flowing out of a fracture in earths surface\nc. melted a zone of fractured rock below earths surface\nd. quick cooling below earths surface

question 3 of 10\nunder which condition below would you expect a coarse - grained intrusive rock like diorite to form?\na. slow cooling at the upper mantle\nb. lava slowly flowing out of a fracture in earths surface\nc. melted a zone of fractured rock below earths surface\nd. quick cooling below earths surface

Answer

Brief Explanations:

Coarse - grained igneous rocks like diorite form when magma cools slowly. Slow cooling allows large crystals to form. Among the options, slow cooling at the upper mantle provides the right condition for slow - cooling and formation of coarse - grained rocks. Magma slowly rising out of a fracture (option B) may cool faster due to exposure. Flowing through a zone of fractured rock (option C) doesn't directly relate to slow cooling for coarse - grained formation. Quick cooling (option D) results in fine - grained rocks.

Answer:

A. Slow cooling at the upper mantle