Page 151 - SST Class 07

B. Fill in the blanks.

1. ______________ is a part of the natural environment.
2. The heat of the sun evaporates water which changes its form and becomes
________________.
3. ______________ is celebrated as World Water Day.

4. ______________ are formed when winds scrape the ocean floor.
5. The highest tsunami ever measured was ______________ high.
6. The tsunami affected the coastal areas across ______________ and ______________ .

C. Give one term for the following.
1. The process by which water changes its form and circulates between
lithosphere, atmosphere and hydrosphere.
2. Streams of water moving in a definite pattern.

3. Giant waves caused by earthquakes on the ocean floors.
D. Answer the following questions.

1. What is the ‘hydrological cycle’?
2. Why is it important to use water judiciously?
3. Explain how tides are caused.

4. What are ocean currents? Which factors give rise to ocean currents?
5. What are the effects of ocean currents?
6. How are tides useful for us?

H TS Question
H TS Question

Ocean water is warmer near the equatorial region. Why?

Activity & ProjectActivity & ProjectActivity & ProjectActivity && ProjectProject & Project
Activity
Activity
A. On an outline map of the world, show the major ocean currents of the world. Use red colour
to mark warm currents and blue colour to mark cold currents.

B. Make a project on “Water is precious, conserve it.”

C. Divided your class into two groups and discuss the topic - “Pros and cons of waves and
tides.”

Value Based Question
Value Based Question
Suppose, you are living in a flood-prone area. You are informed ten hours before about the
arrival of flood. What precautionary measures would you take up at that time?

Social Science-7 151