Why does the water level in seas and oceans remain constant all over the earth?

Tick (√) the best option.

1. Aqueducts are ________________.
   1. Man made
   2. Natural
   3. lakes in mountains
   4. Part of distributaries
2. Indented coast of ________________ make good harbours.
   1. Arctic Ocean
   2. Atlantic Ocean
   3. Pacific Ocean
   4. Indian Ocean
3. The 'Pacific Ring of Fire' is ________________.
   1. A chain of islands
   2. Idea for harbours
   3. A belt of active volcanoes
   4. Series of lagoon lakes
4. ________________ is a major river falls into the Gulf of Mexico.
   1. Amazon
   2. Nile
   3. Mississippi
   4. Huang He
5. Large ships sail into the sea with ________________.
   1. High waves
   2. High tide
   3. Incoming tide
   4. Receding tide

Fill in the blanks.

1. A vast expanse of salt water separated by continents is ________________.
2. The ________________ Ocean is te smallest ocean in the world.
3. The 'Ring of Fire' is along the ________________ Ocean.
4. Lakes formed by Earth's movements are called ________________.
5. The submerged mountain range in the middle of the ocean is known as the ________________.

Write True or False.

1. Lake Baikal is the largest lake in Africa.
2. Rive Nile drains into Mediterranean Sea.
3. Meanders form in coastal regions.
4. Gobind Sagar Lake is a natural lake in Uttar Pradesh.
5. Rivers flow swiftly in upper course.

Match the following columns.