Igneous Rock ID Chart

A fine-grained igneous rock was probably formed by

• weathering and erosion

• great heat and pressure that did not produce melting

• rapid cooling of molten material

• slow cooling of molten material

Tags

NGSS.MS-ESS2-1

Which processes lead directly to the formation of igneous rock?

• Intrusive and extrusive

• lava and magma

• heat and pressure

• crystallization and solidification

Tags

NGSS.MS-PS1-4

Obsidian's glassy texture indicates that it formed

• slowly, deep below Earth's surface

• slowly, on Earth's surface

• quickly, deep below Earth's surface

• quickly, on Earth's surface

Tags

NGSS.MS-PS1-4

Which texture best describes an igneous rock that formed deep underground?

• glassy

• vesicular

• fine grained

• coarse grained

Which graph best represents the relative densities of three different types of igneous rock?

• A

• B

• C

• D

The diagrams below show the crystals of four different rocks viewed through the same hand lens. Which crystals most likely formed from molten material that cooled and solidified most rapidly?

• A

• B

• C

• D

Tags

NGSS.MS-ESS2-1

Which graph best represents the relationship between the length of time molten magma takes to cool and the size of the crystals in the rock formed by the magma?

• A

• B

• C

• D

Select ALL Possible:

Extrusive Rock Textures

• Fine

• Coarse

• Glassy

• Very Coarse

• Vesicular

Igneous rock that forms from lava on Earth's surface

• Organic Rock
• Intrusive Rock
• Clastic Rock
• Extrusive Rock

Which igneous rock is dark colored, cooled rapidly on Earth's surface, and is composed mainly of plagioclase feldspar, olivine, and pyroxene?

• obsidian

• rhyolite

• gabbro

• scoria