Igneous Rocks Lesson

Igneous Rocks

Vocabulary Review

• Mineral: natural, solid substance that has a definite chemical composition and physical structure

• Magma: melted rock within the earth

• Igneous Rock: forms when magma is pushed up from the mantle into the cool crust and hardens into rock

• Lava: Magma that reaches the surface

Multiple Choice

Where is lava located?

• above ground

• below ground

• in the core

• in the mantle

Multiple Choice

Where is magma located?

• above ground

• below ground

• in the stratosphere

• in the thermosphere

Multiple Choice

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

• Intrusive Rock
• Compaction
• Extrusive Rock

Multiple Choice

Igneous rock that forms from lava on Earth's surface

• Organic Rock
• Intrusive Rock
• Extrusive Rock

Obsidian is an example of an extrusive rock. Because it cooled and hardened quickly, extrusive rocks have a fine grained texture.

Granite is an intrusive igneous rock. Because they cool slowly, the crystals are large giving these rocks a coarse texture.

Multiple Choice

Diorite is an intrusive igneous rock. What does this tell you about it?

• it was formed from lava that erupted onto Earth's surface

• it was formed from magma that hardened beneath Earth's surface

• it was formed from rapidly cooling lava

Multiple Choice

Basalt is an extrusive igneous rock. What does this tell you about it?

• it was formed from lava that erupted onto Earth's surface

• it was formed from slowly cooling magma

• it was formed from magma that hardened beneath Earth's surface

Multiple Choice

Pegmatite is a coarse-grained, intrusive, igneous rock. How did it form?

• rapidly cooling lava

• slowly cooling magma

Multiple Choice

Rhyolite is a fine-grained, extrusive, igneous rock. How did it form?

• rapidly cooling lava

• slowly cooling magma

Multiple Choice

Is this igneous rock, obsidian, fine-grained or coarse-grained?

• fine-grained

• coarse-grained

Multiple Choice

Is this igneous rock, porphyry, fine-grained or coarse-grained?

• fine-grained

• coarse-grained

Multiple Choice

What option below is NOT one of the uses of igneous rocks?

• statues

• kitchen counters

• building materials

• chalkboards