Igneous Rocks

What rock is this?

• granite

• basalt

• gabbro

• rhyolite

What rock is this?

• basalt

• obsidian

• pumice

• granite

What rock is this ?

• granite

• rhyolite

• gabbro

• obsidian

What rock is this?

• basalt

• pumice

• obsidian

• granite

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

Tags

NGSS.MS-ESS2-2

The rocks in Yosemite National Park are made out of granite, which tells us they are...

• extrusive

• intrusive

• mafic

• still forming quickly at the surface

How can you tell the difference between extrusive and intrusive igneous rocks?

• extrusive rocks have larger crystals

• intrusive rocks are darker in color

• intrusive rocks have larger crystals

• extrusive rocks are darker in color

What is the relationship between crystal size and cooling time ?

• slower cooling = smaller crystals

• slower cooling = larger crystals

• faster cooling = larger crystals

• faster cooling = more crystals

Tags

NGSS.MS-PS1-4

Extrusive igneous rocks have ​ (a)   crystals because they form ​ (b)   .

• small
• quickly
• slowly
• large

Intrusive igneous rocks have ​ (a)   crystals because they form ​ (b)   .

• large
• slowly
• quickly
• small