soil class 7

Soil is a

• Man made resource

• Natural resource

Agents of weathering of

• Heat

• Wind

• Rain

• All of the above

Tags

NGSS.MS-ESS2-2

What is humus?

• Bacteria

• Fungai

• Organic matter

• Inorganic matter

Tags

NGSS.MS-LS2-3

The top most layer of soul contains

• Rock particles

• Humus

• Nitrogen

• Oxygen

Name the particles that is smallest in size

• Silt

• Sand

• Gravel

• Clay

Name the layer that is between sand and clay

• Silt

• Humus

• Gravel

• None of the above

Vertical section through the soil showing different layers is called

• Types of soil

• Soil texture

• Soil profile

• None of the above

A horizon is also called

• Substratum

• Bedrock

• Topsoil

• Subsoil

_______is darkest colour soil.

• Subsoil

• Bedrock

• Topsoil

• None of the above

_______layer of soil is not porous

• Subsoil

• Substratum

• Top soil

• Bedrock