Question

how would you best describe the texture of an igneous rock that formed extremely slowly underground?
o fine grained
glassy
o pegmatitic
o porphyritic

Explanation:

Igneous rocks that form slowly underground allow large crystals to grow, resulting in a coarse - grained texture. A pegmatitic texture is characterized by very large crystals (usually greater than 1 cm in size) which form from magma that cools extremely slowly. Fine - grained textures form when magma cools quickly (e.g., extrusive igneous rocks). Glassy textures (like obsidian) form when magma cools so quickly that no crystals form. Porphyritic textures have a mix of large and small crystals (from two stages of cooling).

Answer:

C. pegmatitic