Igneous Rocks ESRT

How is an igneous rock formed?

• Compaction and/or cementation of sediments

• Solidification of magma or lava

• Heat and/or pressure

Is this igneous rock intrusive or extrusive?

• Intrusive

• Extrusive

Is this igneous rock intrusive or extrusive?

• Intrusive

• Extrusive

Which igneous rock is made of 100% olivine?

• Obsidian

• Andesite

• Dunite

• Pegmatite

Is pumice mafic or felsic?

• Mafic

• Felsic

Which of the following is a fine-grained mafic igneous rock?

• Pegmatite

• Basalt

• Diorite

• Obsidian

What is the difference between granite and pegmatite?

• Crystal size

• Composition

• Density

• Color

A vesicular igneous rock is

• intrusive

• extrusive

Which igneous rock is glassy and felsic?

• Basaltic glass

• Scoria

• Granite

• Obsidian

Is this rock mafic or felsic?

• Mafic

• Felsic