What are the types of rainwater harvesting?

Give reason for: 

Several accidents take place during cold winter mornings. 

Give reasons for: 

Our feet become wet while walking on grass in cold winter mornings. 

Give reason for: 

Rain maintains the supply of water on land. 

Give reason for:

Floods cause extensive damage to human life and property. 

Across: 
1. two-thirds of the earth's surface is covered with
2. gaseous state of water
3. a waterborne disease

Down:
1. level of groundwater
4. solid-state of water