Ch 4

Question 1

Texture:

Answer 1

feel of a rock’s surface (useful in identifying rocks)

Question 2

Grain:

Answer 2

small pieces that give rocks it’s texture

Question 3

Grain size:

Answer 3

larger grains=coarsed grained (diorite)

small grains=fine grained (slate)

Question 4

Grain shape:

Answer 4

vary widely in shape

smooth/rounded fragments

Question 5

Grain pattern:

Answer 5

banded or nonbanded

Question 6

Geologists observe a rock’s mineral composition by ____ __ _____

Answer 6

color+texture

Question 7

Some rocks contain different amounts of grains(True or False)

Answer 7

True

Question 8

__ minerals make up Earth’s crust

Answer 8

20

Question 9

granite has ___ sillica

Answer 9

high

Question 10

basalt has __ sillica

Answer 10

low

Question 11

3 types of rocks:

Answer 11

igneous, sedimentary, and metamorphic

Question 12

igneous rocks:

Answer 12

made from lava or magma

Question 13

sedimentary:

Answer 13

made from plants, dirt, etc above ground

Question 14

metamorphic:

Answer 14

rocks made/changed by heat or pressure

Question 15

Mineral composition:

Answer 15

the way a mineral is made

Question 16

Silica is formed from:

Answer 16

oxygen and silica

Question 17

uses of igneous rock:

Answer 17

tools and building materials. (statues, forts, bridges, counters, curbstones, floors)

Question 18

granite is also used for _____ and _______

Answer 18

cleaning/scrubbing

Question 19

Native Americans used _____ for tools

Answer 19

obsidian