Extrusive Igneous Rocks Are Typically Finer Grained Than Intrusive Igneous

question 2

Multiple Choice

Extrusive igneous rocks are typically finer grained than intrusive igneous rocks. Why?

• A)The extrusive magma, because it is deep below the surface, cools very slowly producing very small mineral grains.
• B)Intrusive magma flows onto the Earth's surface and cools very slowly, allowing many small mineral grains to grow.
• C)The extrusive magma cools quickly so the mineral grains do not have time to grow.
• D)Intrusive magma is cooler because it is well insulated by the surrounding rock.

---

Definitions:

Research Phase

The initial stage in a project or study where information is gathered and analyzed to understand a problem or topic better.

Key Point

The most important or central idea of a discussion, presentation, or piece of writing.

Bullet Points

A list format used to present information or ideas in a concise and easy-to-read manner.

Highlight Or Italicize

Techniques used in writing to emphasize certain text, with highlighting often involving a bright color and italicizing slanting the text.