NATURAL RESOURCES - PART I

1. Life on earth is dependent upon ---------------, ------------- and ----------.

WHAT ARE THESE RESOURCES ON THE EARTH?

2. The resources on the earth are ------------ , -------------- and ---------------.
3. The outer crust of the earth is called the ------------.
4. Water covers --------------- percent of the Earth's surface.
5. Water is found underground and this is called the ----------------.
6. What is called atmosphere?
7. What is known as the biosphere?
8. What constitute the biotic component of the biosphere?
9. What constitute the abiotic component of the bioshpere?

THE BREATH OF LIFE: AIR

10. Air is a mixture of many gases. Give some examples.
11. Composition of Earth is a result of life on Earth. True or False?
12. What is the major component of the atmosphere in Venus and Mars?
13. Carbondioxide constitutes upto ------------ percentage of the atmosphere on Venus and Mars.
14. How does oxygen help eukaryotic and prokaryotic cells?
15. How is carbondioxide produced by the cells?
16. What is combustion?
17. Combustion  includes human actitivities and forest fires. True or False?
18. How is carbondioxide fixed?
19. Why is the percentage of carbondioxide in our atmosphere a mere fraction?

THE ROLE OF THE ATMOSPHERE IN CLIMATE CONTROL

20. Air is a good conductor of heat. True or False?
21. How does the atmosphere control temperature during day and night?
22. Moon is about the same distance from the Sun as the Earth is. True or False?
23. Moon has no atmosphere. True or False?
24. What is the temperature range of the Moon?
25. Sand and water do not heat up at the same rate. Explain with an experiment.

THE MOVEMENT OF AIR: WINDS

26. What causes the movement of air?
27. What decides the form of this movement?
28. What brings us the welcome rains?
29. How is water vapour formed?
30. How is the atmosphere heated from below?
31. How are convection currents set up in the air?
32. Explain how to understand the nature of convection currents with an activity.
33. Which gets heated faster - air over land or air over water bodies? Why?
34. How is a region of low pressure created?
35. What creates winds?
36. What is the direction of the wind during the day?
37. At night both land and sea start to -------------.
38. Water cools down -------------- than the land.
39. At night, the air above water would be --------------------- than the air above the land.
40. What are the factors that influence the wind?

RAIN

41. Explain with an experiment some of the factors influencing climate changes.
42. What happens when water bodies are heated during the day?
43. How does the water vapour condense?
44. How do the water droplets fall as rain?
45. What happens when the temperature of air is low?
46. When does precipitation occur?
47. Wind patterns decide the rain patterns. True or false?
48. In India ------------------ and --------------------- bring rains.

AIR POLLUTION

49. Name the fossil fuels.
50. Fossil fuels contain small amounts of ------------- and -----------.
51. What gives rise to acid rain?
52. What is smog?
53. What are the diseases caused by air pollution?