What are intrusive igneous rocks?

What are intrusive igneous rocks?

• A. Rocks formed when magma cools beneath Earth's surface
• B. Rocks formed from lava cooling on Earth's surface
• C. Rocks formed from compressed organic materials
• D. Rocks formed from the solidification of minerals in water

Answer: (A)

Intrusive igneous rocks are formed when magma cools and solidifies beneath Earth's surface. This process occurs slowly, allowing for the growth of large mineral crystals, which gives intrusive igneous rocks a coarse-grained texture. Common examples of intrusive igneous rocks include granite and diorite. The formation of these rocks is distinctly different from extrusive igneous rocks, which are formed from lava that cools quickly on the Earth's surface. The other options describe processes unrelated to the formation of intrusive igneous rocks, such as the compression of organic materials or the solidification of minerals from water. These processes lead to sedimentary and metamorphic rocks, respectively, and are not characteristic of igneous rock formation.

Intrusive igneous rocks are formed when magma cools and solidifies beneath Earth's surface. This process occurs slowly, allowing for the growth of large mineral crystals, which gives intrusive igneous rocks a coarse-grained texture. Common examples of intrusive igneous rocks include granite and diorite. The formation of these rocks is distinctly different from extrusive igneous rocks, which are formed from lava that cools quickly on the Earth's surface. The other options describe processes unrelated to the formation of intrusive igneous rocks, such as the compression of organic materials or the solidification of minerals from water. These processes lead to sedimentary and metamorphic rocks, respectively, and are not characteristic of igneous rock formation.