Water Bodies and Their Importance

People obtain their needs of................from lakes, rivers, streams and groundwater.

• oxygen gas

• carbon dioxide gas

• salt water

• fresh water

Among the examples of freshwater bodies in which about 10% of the world's animal species live are………

• rivers and seas.

• streams and seas.

• oceans and seas.

• rivers and streams.

Among the risks that threaten lots of fresh water areas on Earth are…………..

• conservation and scarcity.

• scarcity and poor quality.

• conservation and poor quality.

• conservation and extinction.

Most of water on Earth is……...

• a mixture of fresh and salt water that is found in estuaries.

• fresh water that is found underground.

• salt water that is found in oceans and seas.

• fresh water that is found in lakes.

The area of land where all the water flows in one direction to a common location as ocean is called..............

• tributary.

• estuary.

• wetland.

• watershed.

The level of water in a river may increase causing flooding, when there is more...............

• rainfall.

• wind.

• sunlight.

• sediments.

Tributary usually ends by the flowing of its water into bigger……..

• ocean.

• sea.

• river.

• lake.

The correct flowing of water bodies that are connected with others is……………..

• bigger rivers tributaries oceans.

• tributaries bigger rivers oceans.

• oceans tributaries bigger rivers.

• bigger rivers oceans tributaries.

All the following reasons cause water pollution in a river, except.........

• litter of a nearby trash dump.

• waste of a nearby factory.

• chemical fertilizers of a nearby farm.

• building a dam across the river.

Which of the following can pollute the water of a tributary by the effect of wind blowing?

• Liquid waste materials of factories.

• Water that flows through dams.

• Light litter of trash dumps.

• Sediments in the water of rivers