weathering and soil

The process by which rocks on the land surface break down or crumble because of the elements of weather is

• Erosion

• Weathering

• Gradation

• Degradation

Which of the following defines Physical weathering?

• rocks break up or disintegrate without change in their chemical composition

• rocks break up into smaller fragments with change in their chemical composition

• rocks are weathered by the action of plants and animals.

• none of these

Which of the following is not a layer of soil?

• Topsoil

• Subsoil

• Bottomsoil

• Slightly weathered rocks

Contour tiling is the method of building bunds or embankments made of mud along contour lines.

• True

• False

What does soil contain?

• Humus, clay, sand and silt

• Rocks, minerals, parent rock

• just sand and silt

• none of these

Which of the following are methods of soil conservation?

• Contour tilling

• Contour bunding

• Sedimentation

• Decantation

What is exfoliation?

• the disintegration of rocks grain by grain

• the peeling of rocks in layers

• the dissolving of carbon dioxide in water

• minerals dissolving in water

______ refers to the washing away or removal of soil by various agents like running water or wind.

soil profile is also called

• Soil horizon

• Soil steps

• Soil account

How many types of soil India has

• 4

• 8

• 7

• 6