Ch 26.2

Question 1

What is a rock?

Answer 1

A naturally formed mixture containing minerals, rock fragments, and volcanic glass.

Question 2

How are rocks identified?

Answer 2

By their composition and texture

Question 3

What does the texture of a rock describe about the rock?

Answer 3

The size, shape, and arrangement of the rock’s components

Question 4

Where do intrusive igneous rocks form?

Answer 4

Within Earth’s crust

Question 5

What type of molten rock does intrusive igneous rocks form from?

Answer 5

Crystallized

Question 6

What is the name of the series that illustrates simultaneous crystallization of silicate minerals?

Answer 6

Magma Composition

Question 7

What are the three types of magma?

Answer 7

1. Mafic
2. Intermediate
3. Felsic

Question 8

Which magma type has a low silica content?

Answer 8

Mafic

Question 9

Which magma type has a high silica content?

Answer 9

Felsic

Question 10

Which type of crust has an abundant amount of quartz?

Answer 10

Continental

Question 11

Which type of crust has little to no quartz?

Answer 11

Continental or Oceanic

Question 12

Which type of igneous rock has a coarse grained texture?

Answer 12

Intrusive igneous rocks

Question 13

Which type of igneous rock has a fine grained texture?

Answer 13

Extrusive igneous rocks

Question 14

Do fine grained rocks cool slowly or quickly?

Answer 14

Quickly

Question 15

What are the two specific texture types for extrusive igneous rock?

Answer 15

Vesicular and porphyritic

Question 16

Which texture is the type with holes left behind because of rapid cooling?

Answer 16

Fine-grained

Question 17

Which texture is the type with two different crystal sizes because of different cooling rates?

Answer 17

Porphyritic

Question 18

What type of rock has a vesicular texture?

Answer 18

Pumice