All About Igneous Rocks

The three groups of rocks are classified by

• How they form
• Color
• Grain size
• Chemical Composition

This rock was formed when magma cooled very slowly inside the Earth. What specific type of rock is it?

• Intrusive Igneous Rock
• Extrusive Igneous Rock
• Foliated Metamorphic Rock
• Clastic Sedimentary Rock

This rock formed when lava cooled very quickly on Earth's surface. What specific type of rock is it?

• Extrusive Igneous Rock
• Intrusive Igneous Rock
• Non-Foliated Metamorphic Rock
• Biochemical Sedimentary Rock

When you watch a volcano erupt molten rock, you are seeing _____

• Lava
• Magma
• Mineral Crystals
• Igneous Rocks

Two ways to describe types of igneous rocks are _____

• Extrusive and Intrusive
• Foliated and Non-Foliated
• Clastic and Biochemical
• Black and Gray

What do minerals and rocks BOTH have in common?

• both are made of many minerals
• both are naturally occuring
• both are organic
• both have definite crystalline structures

Which of the following is TRUE about a mineral when compared to a rock?

• Rocks are a mixture of things while minerals are not.
• Minerals are a mixture of things while rocks are not.
• Rocks are classified based on physical properties, minerals are not.
• Minerals are classified based on origin, rocks are not.

One common use for the igneous rock granite is...

• building material
• cutting tools
• abrasion in polishing
• cement

What is the most common type of extrusive rock?

• basalt
• granite
• obsidian
• porphyry

Extrusive forms _________crystals

• small
• large