Water Cycle and Freshwater Sources

The video discusses Earth's water distribution, highlighting that water covers 71% of the planet. It categorizes water into saline, freshwater, and underground channels. Saline water, mainly in oceans, makes up 96% of Earth's water. Freshwater, only 2.5% of total water, is found in rivers, lakes, and glaciers. The human body is 60% water, essential for life. Groundwater is a significant freshwater source, supporting plants and humans. The water cycle ensures water movement between organisms and the environment. The video concludes with the importance of water in global distribution.

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

• 71%

• 50%

• 90%

• 85%

Which of the following is NOT a form of water found on Earth?

• Clouds

• Rocks

• Glaciers

• Rivers

What is the primary function of the water cycle?

• To increase Earth's temperature

• To ensure water moves between organisms and the environment

• To create new water

• To reduce water pollution

What percentage of Earth's water is saline?

• 50%

• 70%

• 96%

• 99%

Which type of water makes up the largest portion of freshwater?

• Swamp water

• Ice and glaciers

• Lakes

• Rivers

What percentage of the human body is composed of water?

• 50%

• 60%

• 80%

• 30%

Which of the following is a major source of freshwater for humans?

• Atmosphere

• Rivers and lakes

• Oceans

• Deserts

What percentage of freshwater is stored as groundwater?

• 5%

• 50%

• 12%

• 25%

How does water return to the ground in the water cycle?

• Evaporation

• Condensation

• Rainfall

• Freezing

What is the role of soil moisture in the water cycle?

• To lock up water for plants

• To increase soil temperature

• To provide nutrients

• To store carbon