Igneous

High silica content in magma=

• Darker-colored rock

• Lighter-colored rock

Low silica content in lava=

• Darker-colored rock

• Lighter-colored rock

Igneous rocks are often called volcanic rocks.

• True

• False

Igneous rocks form whenever lava or magma _____.

• explodes

• heats up

• cools

Is this Intrusive or Extrusive?

• Intrusive

• Extrusive

Pumice is

• Extrusive

• Intrusive

Magma is melted rock ______ the earth's crust.

• above

• below

• in-between

When magma cools underneath the earth's crust, _______ rocks are formed.

• intrusive

• extrusive

When lava cools above the earth's crust, _______ rocks are formed.

• intrusive

• extrusive

Intrusive Rocks Have...

• Lava

• Small Crystals

• Big Crystals

• Grass