Grade 5 Revision quiz

1. What are the causes of water pollution?

• Dumping harmful poisons into the water

• People throwing trash and untreated sewage into the water

• Oil spill

• All of the choices

2. How many percent of drinkable fresh water is available on Earth?

• 70%

• 90%

• 3%

• 8%

3. How many percent of the Earths' water is salty?

• 70%

• 90%

• 97%

• 3%

4. The world is covered by seas by a total of how many percent?

• 90%

• 70%

• 30%

• 50%

5. Without _____________ there would be no life and probably no atmosphere on the Earth.

• Humans

• Soil

• Water

• Air

6. What are the effective ways of soil conservation?

• Plant crops such as beans and grasses families

• We can irrigate the soil

• Crop rotation

• All of the above

7. What will happen to the plants when the soil is becoming worthless?

• Plants become healthy

• Plants become unhealthy or die

• Plants growing more and more

• Plants growing more

8. What causes the soil to become worthless?

• Flood, Drought

• The repeated use of the same land for the same crops.

• Salinization

• All of the above

9. What is the Top layer of the Earths surface?

• Soil

• Environment

• Water

• Air

10. The _____________ is the natural word of Land, sea and Air.

• Environment

• Soil

• Water

• Air