D. Answer in one or two sentences.
1. How is land classified on the basis of land use?
2. What is land degradation? Mention two ways in
which land can be conserved.
3. What is soil erosion? What is the consequence of
soil erosion?
4. Why is fresh water an important natural
resource?
5. What are the causes for water scarcity?
6. What is the difference between seasonal and
perennial rivers?
Answers
Explanation:
1. )The most general or aggregated classification (level I) includes broad land-use categories, such as 'agriculture' or 'urban and built-up' land (Table 1). ... Together these four levels of classification comprise a hierarchical system for describing, monitoring, and predicting land-use and land-cover change.
2) Land degradation means:
Loss of natural fertility of soil because of loss of nutrients.
Less vegetation cover. ...
Changes in the characteristic of soil.
Pollution of water resources from the contamination of soil through which water sweeps into ground or runoff to the water bodies.
3) The effects of soil erosion go beyond the loss of fertile land. It has led to increased pollution and sedimentation in streams and rivers, clogging these waterways and causing declines in fish and other species. And degraded lands are also often less able to hold onto water, which can worsen flooding.
4) Water resources are sources of water that are useful or potentially useful to humans. It is important because it is needed for life to exist. Many uses of water include agricultural, industrial, household, recreational and environmental activities. Virtually all of these human uses require fresh water.
5 )Following are some of the major causes of water shortage:
Climate change.
Natural calamities such as droughts and floods.
Increased human consumption.
Overuse and wastage of water.
A global rise in freshwater demand.
Overuse of aquifers and its consequent slow recharge.
6 ) Perennial rivers are the one which flow throughout the year. They are also called evergreen or ever flowing rivers. ... In contrast the seasons rivers include the Godavari River, Mahanadi, Kaveri , etc. These are rivers which are seasonal in nature i.e they are lively when water of the monsoon fills them.
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