Water Composition and Distribution Facts

The video explores the essential role of water in life, its origins, and its distribution on Earth. It discusses theories about water's extraterrestrial origins and details the composition of Earth's water, highlighting the difference between saline and fresh water. The video also covers the distribution of freshwater sources, including glaciers, ice caps, and groundwater, and explains the presence of water in the atmosphere, surface, and living organisms.

What is one theory about how water arrived on Earth?

• It was created by photosynthesis.

• It was brought by comets from space.

• It was formed by volcanic activity.

• It was a result of meteor impacts.

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

• 60%

• 50%

• 80%

• 71%

How much of Earth's water is saltwater?

• 50%

• 75%

• 99%

• 97.5%

What is the term for water with lower salinity than seawater?

• Distilled water

• Brackish water

• Saltwater

• Freshwater

What percentage of Earth's freshwater is held in glaciers and ice caps?

• 30%

• 50%

• 68%

• 80%

What is the main form of water found in the lower mantle of the Earth?

• Brackish water

• Liquid water

• Ice

• Water vapor

What percentage of surface and other freshwater is found in lakes?

• 40.9%

• 30.5%

• 20.9%

• 10.5%

What is the percentage of water present in the atmosphere?

• 3.0%

• 1.0%

• 2.0%

• 4.0%

What is the percentage of water found in rivers?

• 3.8%

• 2.5%

• 1.2%

• 0.48%

What is the percentage of water present within living organisms?

• 0.26%

• 0.1%

• 0.5%

• 1.0%