What is weathering or rock?

· What is weathering or rock?

Weathering is a part of geological cycle. It consist of disintegration and decomposition of parent rock.

Weathering action take place through physical and chemical agencies.

Physical agencies break down the rock in to smaller particle size without chemical change.

The various agencies responsible for weathering are:-

1. Unequal expansion and contraction due to temperature change.

2. The weeding action of growing root of trees.

3. Abrasion of rock by flowing water, blowing wind and moving ice.

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problem:- A circular tank of diameter 4m contains water up to a height to 5m. Orifice of diameter 0.5m at the bottom. Find the time taken by water:- 1. To fall from 5m to 2m 2. For completely emptying to tank take cd=0.6

A circular tank of diameter 4m contains water up to a height to 5m. Orifice of diameter 0.5m at the bottom. Find the time taken by water:- 1. To fall from 5m to 2m 2. For completely emptying to tank take cd=0.6

Determine the height of a rectangular weir of length 6m to be built across a rectangular channel. Maximum depth of water on the upstream side of the weir is 1.8 and discharge is 2000 l/sec . Take Cd = 0.6 and neglect end contractions.

Determine the height of a rectangular weir of length 6m to be built across a rectangular channel. Maximum depth of water on the upstream side of the weir is 1.8 and discharge is 2000 l/sec . Take Cd = 0.6 and neglect end contractions.

What is OMC (optimum moisture content) and MDD (maximum dry density).

· What is OMC (optimum moisture content) and MDD (maximum dry density). The moisture content goes on increasing till its maximum value of dry density is called maximum dry density (MDD). The moisture content corresponding to the maximum dry density is called optimum moisture content (OMC).

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