EOSC 210: Igneous Rocks

What is a rock made of?

• Soil

• Minerals

• Plastic

• Concrete

What are the three rock types?

• Igneous, minerals, metamorphic

• Igneous, sedimentary, lava

• Intrusive, extrusive and neutral

• Igneous, sedimentary and metamorphic

There are two types of weathering: physical and emotional.

• True

• False

Igneous rocks are classified based on

• Colour

• Texture

• Composition

• Size

Texture of a rock refers to the size, shapes and arrangement of the grains or crystals.

• True

• False

Extrusive rocks are ______ grained, whereas intrusive rocks are ______ grained.

• Coarse, fine

• Fine, coarse

• None of the above

Extrusive rocks cool _____, whereas intrusive rocks cool _____.

• Quickly, slowly

• Slowly, quickly

• None of the above

Crystalline textures include

• Aphanitic

• Proterozoic

• Phaneritic

• Porphyritic

Non-crystalline textures include

• Aphanitic

• Glassy

• Fragmental

• Vitreous

The chemical composition of non-crystalline igneous rocks is typically rich in silica.

• True

• False