Unit Three - Rocks and Minerals - Igneous Rocks

Question 1

What is an Igneous Rock?

(How is it made)

Answer 1

Cooling & Hardening of Magma and Lava

Question 2

A method to classify igneous rocks is…

Answer 2

Environment of Formation - Where the rock formed

Question 3

Two types of igneous rocks

Answer 3

Intrusive (Plutonic) Rocks
Extrusive (Volcanic) Rocks

Question 4

What is an intrusive rock (4)?

Answer 4

1. Formed below Earth’s Surface
2. Hardned from Magma
3. Also known as a “plutonic rock
4. Crystals can be present due to long formation

Question 5

What is an extrusive rock (4)?

Answer 5

1. Formed on Earth’s Surface
2. Formed from Lava
3. Also know as a “volcanic rock”
4. Relatively short formation

Question 6

Definition of Composition

Definition and Types of Igneous

Answer 6

Minerals that make up a rock
Ex: Mafic and Felsic

Question 7

Definition of Texture

Defintion

Answer 7

The appearance and characteristics of rocks

Question 8

Definition of Vesicular

Answer 8

Rocks consisting of gas pockets that looks like holes

Question 9

Definition of Porphyritic (3)

Answer 9

1. Intrusive/Plutonic
2. Large Crystals
3. In a Fine - Grained Matrix

Question 10

How does a vesicular rock form (4)?

Answer 10

1. Typically Extrusive
2. Hardens Quickly
3. Volcanic Gas is Trapped in the Rock
4. When it escapes, it leaves gas pockets, or holes