Igneous rocks are classified by

Question 10 options:

texture and presence of fossils.

texture and size.

composition and age.

composition and texture.

Answer

Option D - texture and composition

Explanation

Igneous rock is formed from the molten rock deep within the earth that has cooled or it is formed from the molten rock that has reached the surface and cooled (lava). Igneous rock is classified according to their texture and composition. On the basis of texture, they are classified into extrusive igneous rock and intrusive igneous rock. Intrusive cools inside the earth surface example, granite while extrusive cool outside the earth's surface example Obsidian. It is composed of felsic, intermediate, mafic and ultramafic.