EVERYDAY SCIENCE

Detailed explanation-1: -The texture of an igneous rock depends on the time it takes the rock to harden. The slower the cooling rate is, the larger the crystals will form. → these are intrusive rocks or familiarly called coarse-grained. If the cooling rate is fast, small crystals will form.

Detailed explanation-2: -The texture of an igneous rock (fine-grained vs coarse-grained) is dependent on the rate of cooling of the melt: slow cooling allows large crystals to form, fast cooling yields small crystals.

Detailed explanation-3: -Fig. 3.2: Intrusive igneous rocks form at some depth within the crust due to slow cooling of magma, resulting in formation of large crystals. Individual crystals can be seen with the naked eye. These rocks are termed texturally as coarsely crystalline or phaneritic.

Detailed explanation-4: -igneous rocks are also called volcanic rocks. They cool from magma slowly in the crust. They have large crystals.

Detailed explanation-5: -Intrusive (Plutonic) Rocks Intrusive igneous rocks are generally wholly crystalline and characterized by large crystal sizes visible to the naked eye because they cool slowly.