Respuesta :
ANSWER:
Extrusive igneous rocks are characterized by a fine-grained and glassy texture. These rocks are formed because of crystallization of magma on the surface of the earth.
EXPLANATION:
- Extrusive igneous rocks cool very quickly near the surface of the earth which does not allow their crystals to grow much in size.
- In contrast, intrusive igneous rocks are formed because of crystallization of magma under the surface of the earth. Intrusive igneous rocks have large crystals.
