Igneous Rocks

Igneous rocks that form deep underground will develop textures that are

• coarse-grained due to slow cooling of magma

• coarse-grained due to rapid cooling of lava

• fine-grained due to slow cooling of magma

• fine-grained due to rapid cooling of lava

A fine grained igneous rock with a mineral composition of 35% quartz, 35% potassium feldspar, 15% plagioclase feldspar, 10% biotite, and 5% amphibole is called

• Basalt

• Andesite

• Obsidian

• Rhyolite

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

A type of rock that forms from the cooling of molten rock at or below the surface of the Earth

• Igneous Rock
• Metamorphic Rock
• Sedimentary Rock
• Chemical Rock

Igneous rock that forms from lava on Earth's surface

• Extrusive Rock

• Intrusive Rock

Igneous rock that forms when magma hardens beneath Earth's surface

• Intrusive Rock
• Compaction
• Extrusive Rock

This rock cools so quickly that crystals have no time to form.

• Basalt
• Obsidian
• Gabbro
• Pumice

Extrusive rocks that form quickly above the Earths surface have

• small crystals
• large crystals
• small and large crystals
• no crystals

Where is magma found?

• inside Earth

• on the surface of the Earth

Where is lava found?

• inside Earth

• on the surface of the Earth