WHAT I HAVE LEARNED, Activity 7: Complete Me!

1. The word igneous is derived from the Latin word for _________, ignis or ignus.

Igneous rocks are formed through the process of _________ and crystallization of molten rocks; magma and lava.

When hot, molten rocks reach the surface of the earth, they undergo changes in temperature and pressure causing them to _________, solidify and crystallize.

In terms of formation, igneous rocks can be classified into two; intrusive and _________ rocks.

Intrusive rocks are formed solidified magma while extrusive rocks are formed from solidified _________.

Intrusive rocks cool slowly while extrusive rocks cool _________.

Intrusive rocks have _________ grains and crystals while extrusive rocks have small or no grains and crystals.

Examples of intrusive rocks are gabbro, diorite, and _________.

Examples of extrusive rocks are _________, obsidian, rhyolite, and scoria.

Igneous rocks can also be classified according to their composition. They are composed of ________.