The video highlights the critical role of water in human health, emphasizing that 70% of the human body is water. It discusses the necessity of drinking 8-10 glasses of water daily and the importance of water for all living organisms. The video also covers water usage in domestic, agricultural, and industrial contexts, noting that most household water is used for flushing toilets. Despite Earth's abundance of water, only a small fraction is fresh and usable, with most being saline. The video explains the distribution of water on Earth and the significance of conserving freshwater, which is sourced from surface and groundwater.

What percentage of the human brain is composed of water?

• 80%

• 60%

• 50%

• 70%

Which activity uses the most water in households?

• Personal hygiene

• Flushing the toilet

• Household cleaning

• Cooking

What percentage of Earth's surface is covered with water?

• One-third

• Half

• Three-fourths

• Two-thirds

Why is most of the water on Earth not suitable for drinking?

• It is underground

• It is frozen

• It is saline

• It is polluted

What is the approximate percentage of fresh water available for human use?

• 2%

• 3%

• 0.5%

• 1%

What is the main source of drinking water supplied to homes?

• Surface water and groundwater

• Desalinated water

• Rainwater

• Ocean water

How does groundwater get stored underground?

• It is transported from lakes

• It is pumped from rivers

• It seeps into the ground and is stored above a hard rock layer

• It is collected from rainwater