In some extremely cold places, the temperature falls below zero degree Celsius. This causes the water vapour present in the air to freeze and deposit itself on the grass or leaves in the form of white powdery mass. This is called frost.

Match the following. Column A Column B 1. Water can flow a. by filtration 2. You can purify water b. on windy days 3. The rate of evaporation increases c. when the air is dry 4. Water evaporates faster d. through porous rocks

When it rains, some of the water seeps into the ground. This water passes through the soil and through the porous rocks. The impurities in water are removed by pouring it through a filter paper. We can purify water by a process called filtration. Evaporation rates are generally higher in hot, dry and windy climates. Water evaporates faster when the air is warm and dry. Column A Column B 1. Water can flow d. through porous rocks 2. You can purify water a. by filtration 3. The rate of evaporation increases b. on windy days 4. Water evaporates faster c. when the air is dry

E M B I B E

Learning Elementary SCIENCE with ONLINE Support.>Chapter 9 - Weather and Water>Think & Answer>Q B

MEDIUM

4th CBSE

IMPORTANT

Earn 100

Define frost.

Important Questions on Weather and Water

EASY

4th CBSE

IMPORTANT

Learning Elementary SCIENCE with ONLINE Support.>Chapter 9 - Weather and Water>Think & Answer>Q B

Define sedimentation.

MEDIUM

4th CBSE

IMPORTANT

Learning Elementary SCIENCE with ONLINE Support.>Chapter 9 - Weather and Water>Think & Answer>Q C

Match the following.

Column A	Column B
1. Water can flow	a. by filtration
2. You can purify water	b. on windy days
3. The rate of evaporation increases	c. when the air is dry
4. Water evaporates faster	d. through porous rocks