Q20. What is precipitation?
Q21. What is water cycle?
Q22. What are tides and how are they caused?
Q23. Which factors affect the movement of ocean water?
Q24. Why is our earth like a terrarium?
Q25. Write a short note on waves?
Q26. What are the factors affecting the height of the waves?
Q27. What are spring and neap tides?
Q28. Why are tides important to us?
Q29. Three-fourth of the earth surface is covered by water. Give the distribution of water in percentage?