IV. Answer in brief.
1. Where is red soil found?
2. Name two different types of Alluvial soil.
3. What causes soil erosion?
4. Which soil is developed as a result of leaching?
5. What is the cause of desertification and landslides?
V. Answer in brief.
1. Which types of soils are found in India?
2. How can we prevent soil erosion?
3. Describe the features of black soil.
4. Why do crops grow well in alluvial soil?
5. What is weathering?
Answers
IV. 1. It is found in Indian states such as Tamil Nadu, southern Karnataka, north-eastern Andhra Pradesh and some parts of Madhya Pradesh, Chhattisgarh and Odisha.
2. Khadar and Bhangar
3. Water Erosion and Surface Water Runoff. One of the main causes of soil erosion is water erosion, which is the loss of topsoil due to water. Raindrops fall directly on topsoil.
4. Laterite soil by heavy rain
5. Desertification is caused by a variety of factors, such as climate change and human activities.
A landslide is any geologic process in which gravity causes rock, soil, artificial fill or a combination of the three to move down a slope.
V. 1. Alluvial soil, red soil, black soil, area soil, laterite soil, saline soil, marshy soil, forest soil, sub- mountain soil, snowfield
2. Plant grass and shrubs, add mulch or rocks, put down fiber logs, improve drainage, avoid soil compaction.
3.The following are five important characteristics of Black soil: It is fine textured and clayey in nature. It has high amounts of lime, iron, magnesium and generally low quantities of phosphorus, nitrogen and organic matter. It is black in colour since it is formed from weathered lava rocks.
4. Alluvial soil is good for crop growth because it is fertilised and has minerals and nutrients in it. for example paddy paddy grows in Alluvial soil it has the capacity to hold the water,root is binded with Alluvial soil .
5. Weathering is the breakdown of rocks at the Earth’s surface, by the action of rainwater, extremes of temperature, and biological activity. It does not involve the removal of rock material.