Question

extrusive and intrusive rocks​

Answer 1

Answer:

Explanation:

INTRUSIVE

Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form.

Examples of intrusive igneous rocks are diorite, gabbro, granite, pegmatite, and peridotite.

EXTRUSIVE

Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals.

Answer 2

Extrusive and intrusive rocks

Explanation:

Extrusive Rocks

When magma reaches the earth's surface ,it causes volcanic eruption . This eruption generates extensive lavaflows . The rocks formed due to solidification of lava are called '' extrusive rocks '' . The extrusive rocks are also called '' volcanic rocks '' .As the lava tend to cool crystallize rapidly , the texture of volcanic rocks are generally fine grained or glassy . Volcanic rocks often contains gas cavities , called , called the ''vesicles '' . These rocks sometimes show ''flow structure '' which is the the result of movement in a viscous lava .

Intrusive Rocks

''intrusive rocks '' are formed when magma crystallises beneath the earth surface. Depending on the depth of formation , intrusive rocks are divided into two groups : plutonic rocks , hypabyssal rocks .