NCERT 6th Class (CBSE) Science: Water and Its Importance

Question: How does heavy rain affect us?

Answer: Heavy rains may cause:

1.  A rise of water level in dams, rivers, lakes, etc.
2.  Water logging and floods.
3.  Floods cause damage to property, crops and animals.

Question: How does the failure of rainfall affect people on the earth?

Answer: The failure of rainfall can cause the following:

1. The soil becomes dry.
2. Water level in rivers, lakes, dams, etc. may fall. Ponds and canals may even dry up.
3. The ground water level falls.

Question: Name two processes responsible for the formation of clouds.

Answer: Evaporation and transpiration.

Question: During winters why do we see more fog in close areas where there are lots of trees?

Answer: Due to lots of trees, air at that place contains much more water vapour during winters. These vapour condense on dust or smoke particles forming thick fog.