Igneous Rocks

The size of crystals in Igneous Rocks depends upon

• pressure

• the presence of air

• the presence of water

• cooling rate

Rocks that are formed from magma or lava are called

• sedimentary

• metamorphic

• igneous

• clastic

All rocks are classified based upon

• the way they are formed

• the elements they contain

• the latitude and longitude where they are formed

• the layers that are present

The color of an Igneous rock tells about the rock's

• location

• texture

• cooling rate

• composition

Igneous rocks are classified based upon their composition and

• size

• texture

• layers

• how they taste

Extrusive rocks are formed

• underwater

• in a lab

• deep underground

• above the surface of a volcano

Coarse-grained intrusive igneous rocks result when

• Sedimentary rocks are cemented and compacted.

• magma cools quickly

• magma cools slowly

• lava cools quickly

Which characteristics could help you identify an igneous rock as cooling on the surface?

• Vesicles (air bubbles) and large crystals

• Vesicles (air bubbles) and very small or no crystals

• Large crystals and multi-colored

• Being dark or light in color and having layers

The most common INTRUSIVE igneous rock is

• granite

• gabbro

• rhyolite

• sandstone

Mafic rocks are

• light in color due to high silica content

• coarse-grained

• dark in color due to their high iron and magnesium content

• fine grained