The Vital Role of Water in Life on Earth

The video discusses the essential role of water in life, covering its properties, uses, and the water cycle. It highlights the limited availability of fresh water and the impact of water pollution. The lesson aims to educate on water's importance, its cycle, and pollution control.

Why is water considered essential for life on Earth?

• It is used to build structures.

• It is necessary for the survival of all living things.

• It is used for transportation.

• It is a source of energy.

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

• 50%

• 60%

• 70%

• 80%

Which of the following is NOT a property of water?

• Universal solvent

• Colorful

• Odorless

• Tasteless

What is the chemical formula for water?

• CO2

• O2

• H2

• H2O

What percentage of Earth's water is fresh and available for consumption?

• 10%

• 5%

• 3%

• 1%

Which of the following is a recreational use of water?

• Swimming

• Cooking

• Cleaning

• Gardening

Which process in the water cycle involves water vapor turning into liquid droplets?

• Precipitation

• Condensation

• Evaporation

• Transpiration

What is the process called when plants release excess water into the air?

• Condensation

• Evaporation

• Transpiration

• Precipitation

What is the main cause of water pollution?

• Excessive rainfall

• Sewage and industrial waste

• Natural disasters

• Overfishing

How can we control water pollution?

• By not disposing harmful chemicals into water bodies

• By disposing of garbage in rivers

• By using more water for irrigation

• By increasing industrial production