Igneous Rocks

Intrusive Igneous rocks will be 

• coarse grain
• fine grain

If an Igneous rock is dark-colored, what is the amount of silica?

• high
• low
• doesn't matter

How do Intrusive Igneous rocks cool?

• quickly
• slowly
• really fast

Igneous rocks  form from ___________ or _____________. 

• lava or pressure
• lava or magma
• pressure or crystallization 

Extrusive forms _________crystals

• small
• large

The process by which igneous rocks are formed...

• heat and pressure deep underneath earth's surface
• melting and cooling of magma
• compaction and cementation of sediments

The type of igneous rock formed depends on all of the following EXCEPT _____.

• the amount of dissolved gases in magma
• where the rocks are formed and the rate at which it cooled
• the amount of weathering and erosion the rock has been through
• the mineral composition of the magma

Which would most likely cause molten rock material to become a glassy igneous rock?

• cooling over a long period of time
• cooling under high pressure
• cooling on the earth's surface 
• cooling at great depth within the earth

According to ESRT's, which rock is of felsic composition, low density, light in color, and coarse grained?

• rhyolite
• basalt
• granite
• gabbro

How is crystal size related to the rate a molten material cools

• the faster it cools the smaller the crystal
• the faster it cools the larger the crystal
• the slower it cools  the smaller the crystal