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Yogita Ingle 5 years, 3 months ago
The poet liked to tease and play with the squirrel. Whenever the poet went a little close to the squirrel, the squirrel would run away in the other direction.
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Yogita Ingle 5 years, 3 months ago
The 3 main factors that affect barometric (air) pressure are:
- Temperature: When the temperature of a place increases, the atmospheric pressure decreases. This happens because an increase in the temperature results in the heating of the air. Warm air expands. The molecules of the warm air become less dense and hence exert less pressure. On the contrary, decrease in temperature makes the air cool and dense. This creates a high pressure area in a region.
- Altitude: Atmospheric pressure decreases with an increase in the altitude. Air is compressible. As the gravity of the Earth pulls the molecules and gases towards the ground, the lowest layer of the air becomes densest. This dense layer of air exerts the greatest pressure.
- Rotation of the Earth: The rotation of the Earth causes the air at the Poles to be pushed away towards the Equator. In theory, air should have been accumulated at Equator creating a high pressure belt. However, this does not happen. On the contrary, the air gets heated at the Equator, and rises up creating a low pressure.
Posted by Hindu ?? 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
Sunlight falls almost vertically on the equator, while it falls at slanting angle on the poles. Due to this, amount of insolation decreases from equator towards poles.
Posted by . . 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
The kind of irrigation developed in the Tamil region were wells and tanks, helped to collect rainwater and river channels.
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Posted by Puneet Verma 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
Given,
Amount of water = 200 mL
Percolation time = 40min
Rate of percolation = Amount of water in mL / Percolation time in min
=200 / 40
=5 mL/min.
Hence, the rate of percolation of water through the given soil sample is 5 mL/min.
Posted by Puneet Verma 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
- A vertical section through different layers of the soil is called the soil profile. Each layer differs in feel (texture), colour, depth and chemical composition.
- These layers are referred to as horizons.
- The uppermost horizon is generally dark in colour as it is rich in humus and minerals. The humus makes the soil fertile and provides nutrients to growing plants. This layer is generally soft, porous and can retain more water. It is called the topsoil or the A-horizon.
- The next layer has a lesser amount of humus but more of minerals. This layer is generally harder and more compact and is called the B-horizon or the middle layer.
- The third layer is the C-horizon, which is made up of small lumps of rocks with cracks and crevices.
Posted by Puneet Verma 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
Soil pollution refers to the contamination of soil with anomalous concentrations of toxic substances.
Example: Soil contamination that includes high levels of benzene raises the risk of leukaemia.
Soil pollution can be controlled by the following measures:
- By reducing the use of plastics, we can reduce soil pollution.
- By controlling the use of chemical fertilisers and pesticides, we can control soil pollution.
- Treating industrial waste before releasing.
Soil erosion is the natural process in which the topsoil of a field is carried away by physical sources such as wind and water. Soil erosion can be controlled by the following measures:
- Plant trees on barren lands to limit erosion of soil.
- Add mulch and rocks to prevent the plants and grass underneath to prevent soil erosion.
- Mulch matting can be used to reduce erosion on the slopes.
- Put a series of fibre logs to prevent any water or soil from washing away.
- A wall at the base of the slope can help in preventing the soil from eroding.
- Every household should have a proper drainage system so that water flows down into proper water collecting systems.
Posted by Puneet Verma 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
Clayey soil has very small sized particles. These particles are packed tightly and therefore can retain water. Clayey soil is also rich in organic matter. For growing crops such as wheat, gram, and paddy, the soil should be good at retaining water and rich in organic matter is suitable. Therefore, clayey soils having these characteristics are useful for such kind of crops.
Posted by Makam Charan Vikas 5 years, 3 months ago
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