Lets Recall!

3. It is the narrow zone of contact between the lithosphere, hydrosphere and atmosphere; in which life exists.
6. An international convention that lists several species of animals and birds in which trade is prohibited..
7. The living beings are inter-related and interdependent on each other for survival within this life supporting life system.
10. Rocks are piled up to make a dam.
11. This is done in hilly areas. It helps in reducing soil erosion which may happen because of run-off.
13. Trees of this forest do not shed their leaves at a particular time in a year. They are found in tropical regions which get plenty of sunshine and rainfall.
15. The last layer of soil profile is composed of huge rocks.
16. This is the second layer of soil. It is composed of sand, silt and clay.
17. Trenches are made in front of the barriers to collect water. These help in preventing soil degradation which may happen due to rainwash.
18. A natural area designated to protect the ecological integrity of one or more ecosystems for the present and the future generations
19. Trees of this forest shed their leaves at a particular time in a year. They are found in subtropical regions which get moderate sunshine and rainfall.
22. This type of irrigation is used In dry regions with high rates of evaporation.
24. Removal of topsoil

1. Physical features of land topography
2. These are Series of protected areas linked through a global network, intended to demonstrate the relationship between conservation and development.
4. The breaking up and decay of exposed rocks, by temperature changes, frost action, plants, animals and human activity.
5. This method is used in coastal areas and in dry regions. This helps in preventing soil erosion from wind.
8. In this method, different crops are grown in alternate rows. Crops are grown at different times. It helps in preventing soil erosion from rain wash.
9. Loss of moisture in plants
12. In this method, the bare ground is covered with organic matter like straw. Covering the soil helps in retaining the moisture in soil.
14. The topmost layer of land which is composed of grainy substance.
20. The arrangement of different layers of soil at a place.
21. Use of land for various purposes
23. In this method, ploughing is done parallel to the the hill slope. It helps in forming a natural barrier and prevents water from flowing down the slope.