Igneous rocks

Magma that is low in silica usually forms light-colored rocks, such as granite.

• True

• False

How do coarse-grained intrusive igneous rocks form?

• from sedimentary rocks changed under pressure

• from large rock particles cemented together

• from rapidly cooling lava

• from slow cooling magma

Extrusive rocks have larger grains than intrusive rocks.

• True

• False

An igneous rock that is formed from lava is called an

• Extrusive

• Intrusive

Extremely rapid cooling of lava in which no crystals form, creates what type of texture?

• Fine-Grained

• Coarse-Grained

• Glassy

Low silica content in lava=

• Darker-colored rock

• Lighter-colored rock

How do Intrusive Igneous rocks cool?

• quickly
• slowly
• really fast

Coarse or Fine

• coarse
• fine

Describe this rock

• Intrusive , High Silica
• Intrusive , Low Silica
• Extrusive , High Silica
• Intrusive , Low Silica

The rocks in Volcanoes National Park Hawaii are forming as the hot lava coming out of the volcanoes cools. These rocks are definitely...

• extrusive

• intrusive

• coarse grained

• forming very slowly