Chapter6

Question 1

If you look at soil with a hand lens, you will find small pieces of rocks, minerals, and —–.

Answer 1

Humus

Question 2

You might not see them, but soil is made up of —–, air, and —— ——.

Answer 2

Water

Living things

Question 3

When plants and animals die, ——– and fungi decompose them

Answer 3

Bacteria

Question 4

All the layers of soil, from earths surface down to the bedrock, are shown in a

Answer 4

Soil profile

Question 5

The different layers of soil profile are called ——- and include topsoil, ——-, and weathered ——.

Answer 5

Horizon
Subsoil
Bedrock

Question 6

The property of soil that refers to the size of soil particles is called ——-

Answer 6

Texture

Question 7

Other properties of soil are color and ————, which indicates how easily—– passes through soil.

Answer 7

Permeability

Water

Question 8

The spaces between the particles in soil, called pore spaces, determine how —— the soil is.

Answer 8

Porous

Question 9

Soil that is permeable to air and —– will allow living things to survive.

Answer 9

Water

Question 10

If the soil does not hold enough water, crop plants can — –. If the soil holds too much water.

Answer 10

Dry up

Drown

Question 11

Nonliving, natural substances that make up rock are called

Answer 11

Minerals

Question 12

Minerals can be identified by their ———-: color, ——–, luster, and streak

Answer 12

Properties

Hardness

Question 13

Minerals can be identified by their ———-: color, ——-, luster, and streak.

Answer 13

Properties

Hardness

Question 14

Minerals are the building blocks of

Answer 14

Rocks

Question 15

Minerals offer clues about how a rock

Answer 15

Forms

Question 16

A rock that forms from melted rock is called ——- rock

Answer 16

Igneous

Question 17

Melted rock, called —–, cools and hardens to form igneous rock

Answer 17

Magma

Question 18

Igneous rocks are classified by how quickly they —- and the size of the mineral

Answer 18

Cool

Question 19

Layers of substances are pressed and cemented together to form ———– rocks

Answer 19

Sedimentary

Question 20

Scientists compare the position of layered rocks to find a rocks ——– age

Answer 20

Relative

Question 21

A rock layer and any —— in that rock have the same relative age.

Answer 21

Fossil

Question 22

Heat and pressure form ———– rocks

Answer 22

Metamorphic

Question 23

Metamorphic rocks can form from ——- and ———- rocks, or from other metamorphic rocks.

Answer 23

Igneous

Sedimentary

Question 24

Metamorphic rocks are different than their original form because their ———- change

Answer 24

Properties

Question 25

Rocks change from one to another in the

Answer 25

Rock cycle