Surface of the Earth - Soil comes from Rocks (Topic 15)
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Key Words: Topsoil
The layer of soil That lies on the surface of the Earth
Key Words: Decompose
Break down into smaller pieces
Key Words: Fertile Soil
Soil in which plants can grow well
Key Words: Subsoil
The layer of soil That lies undertook the topsoil
Name the four layers of a cross section of soil.
• Topsoil • Subsoil • Pieces of rock & soil • Solid rock
How does topsoil form?
It forms as rocks break down into smaller and smaller pieces.
What is so important about topsoil?
It is usually fertile and it is what plants grow in.
How do the rocks break down to become soil?
• The chemicals in the water and air weaken and crumble the rock • The roots of plants break open the rock
What else is combined with the rocks to make topsoil?
Dead plants and animals.
Give two other names for humus.
Compost Top soil
What role can farmers play to preserve the topsoil?
The must farm in ways that cause as little erosion as possible.
Out of these three, which will hold them most amount of water and the least amount of water? • Clay • Loam • Sand
• Most = clay 2. Least = Sand