Chapter 3a

Question 1

Igneous rocks are made of?

Answer 1

Lava- surfaced magma that has cooled and crystallized

Question 2

What does it mean if a rock was cooled Intrusively?

Answer 2

Cooled and solidifies within the Earth
•Plutonic
•Large crystals

Question 3

What does it mean if a rock was cooled Extrusively?

Answer 3

Cooled and solidified at or near the surface
•Volcanic
•Fine-grained crystals

Question 4

What are the six Igneous textures?

Answer 4

1. Phaneritic
2. Aphaneritic
3. Porphyritic (DOES NOT mean porous)
4. Vesicular
5. Glassy
6. Pyroclastic

Question 5

What is the definition of Phaneritic?

Answer 5

Coarse-grained

Question 6

What does Aphaneritic mean?

Answer 6

Fine-grained

Question 7

A Vesicular texture is cause by what?

Answer 7

Escaping gases

Question 8

A Glassy texture is cause by what when forming?

Answer 8

Very fast cooling during volcanic eruption

Question 9

What does Pyroclastic mean?

Answer 9

Fused particles from volcanic eruptions

“Fire particles”

Question 10

What is Lithification?

Answer 10

Cementation and compaction

Question 11

What are the four Igneous Compositions?

Answer 11

1. Felsic (Granite)
2. Andesitic (Intermediate)
3. Mafic (Basaltic)
4. Ultramafic (mostly found in the mantle)

Question 12

What are some examples of Felsic rocks?

*May not need to know?

Answer 12

• Granite
• Rhyolite (basically pink)
• Obsidian
• Pumice

Question 13

What are some examples of Andesitic rocks?

*May not need to know?

Answer 13

• Diorite

* Andesite

Question 14

What are some examples of Mafic rocks?

*May not need to know?

Answer 14

• Gabbro
• Basalt
• Scoria