Soil Profiles and Formation

Soil is a loose mixture of:

• Organic materials.

• Organic and inorganic materials.

• Dead and decaying micro organisms.

The soil horizons are different from each other based on their

• Chemical and physical features.

• Physical features mainly color and texture.

• Chemical features only.

The layer which is poor in organic matter is known as:

• Topsoil

• Subsoil

• O layer

The rate of weathering and formation of soil is determined by :

• Number of micro organisms present in the soil.

• Temperature and rainfall.

• The types of rocks.

What happen in the first process of soil formation?

• Sediments and tiny rock particles deposits.

• Weathered rocks are worn away.

• Sediments accumulates.

Soil productivity can be increased by the addition of

• Nutrients

  Organic Matter

  Water

• Air

  Water

  Vitamins

• Organic Matter

  Air

  Lead

Tags

NGSS.MS-LS2-3

What is the movement of soil from one place to another?

• Deposition

• Erosion

• Discharge

Which of the following shows where erosion happens at a faster rate?

• Cold dry climate

• Steep slopes

• Valleys and flat areas

Tags

NGSS.MS-ESS2-2

Which factor is NOT involved in soil formation?

• Parent material

• Temperature

• Climate

• Cultivating

Which of the characteristics describes O horizon of soil profile?

• Consist rocks and big particles

• Have large masses of rocks

• High in organic matter

• Plants root do not penetrates into the layer.

• Have less humus

Tags

NGSS.MS-LS2-1