Surface of the Earth - Soil comes from Rocks (Topic 15)

Question 1

Key Words:

Topsoil

Answer 1

The layer of soil

That lies on the surface of the Earth

Question 2

Key Words:

Decompose

Answer 2

Break down into smaller pieces

Question 3

Key Words:

Fertile Soil

Answer 3

Soil in which plants can grow well

Question 4

Key Words:

Subsoil

Answer 4

The layer of soil

That lies undertook the topsoil

Question 5

Name the four layers of a cross section of soil.

Answer 5

1. Topsoil
2. Subsoil
3. Pieces of rock & soil
4. Solid rock

Question 6

How does topsoil form?

Answer 6

It forms as rocks break down into smaller and smaller pieces.

Question 7

What is so important about topsoil?

Answer 7

It is usually fertile and it is what plants grow in.

Question 8

How do the rocks break down to become soil?

Answer 8

1. The chemicals in the water and air weaken and crumble the rock
2. The roots of plants break open the rock

Question 9

What else is combined with the rocks to make topsoil?

Answer 9

Dead plants and animals.

Question 10

Give two other names for humus.

Answer 10

Compost

Top soil

Question 11

What role can farmers play to preserve the topsoil?

Answer 11

The must farm in ways that cause as little erosion as possible.

Question 12

Out of these three, which will hold them most amount of water and the least amount of water?

1. Clay
2. Loam
3. Sand

Answer 12

1. Most = clay

2. Least = Sand