6 IS 2.3

What is extrusive rock?

• Rock formed from lava on Earth's surface

• Rock formed from magma beneath Earth's surface

• Rock with large crystals

• Rock with no crystals

What is the most common extrusive rock?

• Granite

• Basalt

• Rhyolite

• Pegmatite

What is intrusive rock?

• Rock formed from lava on Earth's surface

• Rock formed from magma beneath Earth's surface

• Rock with a glassy texture

• Rock with no crystals

What type of igneous rock is rhyolite?

• Extrusive

• Intrusive

• Sedimentary

• Metamorphic

What is obsidian used for by ancient Native Americans?

• Jewelry

• Sharp tools for cutting and scraping

• Building materials

• Cooking pots

What is perlite used for?

• Building roads

• Starting vegetable seeds

• Making jewelry

• Cooking

Why might the Incas have chosen igneous rock for their fortress?

• It is lightweight

• It is colorful

• It is strong enough to withstand attacks

• It is easy to carve

Where are diamonds trapped after being thrust to the surface?

• Inside sedimentary rock

• Inside volcanic rock

• Inside metamorphic rock

• Inside limestone

What is the function of volcanic pipes in diamond formation?

• They cool the diamonds

• They transport diamonds to the surface

• They melt the diamonds

• They hide the diamonds