Earth's Spheres and Water Distribution

This video explores Earth's four main spheres: atmosphere, geosphere, hydrosphere, and biosphere. It explains how each sphere is distinct yet interconnected, with the Sun as a major energy source. The atmosphere is a mix of gases, primarily nitrogen and oxygen, and is crucial for weather and climate. The geosphere consists of Earth's core, mantle, and crust, made up of rocks and minerals. The hydrosphere includes all water forms, with most being oceanic saltwater. The biosphere encompasses all life forms, existing in diverse environments. Together, these spheres form a complex, interdependent system.

Which of the following is NOT one of Earth's main spheres?

• Biosphere

• Lithosphere

• Hydrosphere

• Atmosphere

What is the main source of energy for Earth's processes?

• The Sun

• The Moon

• The Earth's core

• The atmosphere

What percentage of the atmosphere is composed of nitrogen?

• 99%

• 21%

• 78%

• 50%

Which sphere includes Earth's weather systems?

• Geosphere

• Hydrosphere

• Atmosphere

• Biosphere

Which layer of the geosphere do we live on?

• Lithosphere

• Crust

• Core

• Mantle

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

• 90%

• 60%

• 50%

• 75%

What is the primary form of water in the hydrosphere?

• Freshwater

• Saltwater

• Glaciers

• Groundwater

What percentage of the hydrosphere is freshwater?

• 10%

• 25%

• 3%

• 50%

Which of the following is NOT a component of the biosphere?

• Animals

• Rocks

• Plants

• Bacteria

Where can life NOT be found on Earth?

• None of the above

• High in the atmosphere

• At the bottom of the ocean

• Deep underground