Essential Earth: Resources and Life-Supporting Systems

The video tutorial explores Earth's unique ability to support life, focusing on the biosphere's components: lithosphere, hydrosphere, and atmosphere. It discusses natural resources, distinguishing between renewable and non-renewable types, and highlights the importance of air, water, soil, and forests. The tutorial emphasizes the role of these resources in sustaining life and the impact of human activities on their availability.

What is the biosphere?

• A layer of gases surrounding the Earth

• The life-supporting zone where the atmosphere, hydrosphere, and lithosphere interact

• The water bodies on Earth's surface

• The outer crust of the Earth

Which of the following is a renewable resource?

• Coal

• Natural gas

• Sunlight

• Petroleum

Why can renewable resources become exhaustible?

• They are not naturally replenished

• They are used faster than they are renewed

• They are only available in limited areas

• They are not affected by human activities

What is the main component of air on Venus and Mars?

• Water vapor

• Oxygen

• Nitrogen

• Carbon dioxide

How do marine plants help maintain the carbon dioxide levels in the atmosphere?

• By producing water vapor

• By absorbing nitrogen

• By converting carbon dioxide into glucose

• By releasing oxygen

Where is most of the Earth's fresh water found?

• In ice caps and snow-covered mountains

• In the atmosphere

• In underground reservoirs

• In oceans

Why is water essential for organisms?

• It is used for shelter

• It is a source of food

• It is a medium for chemical reactions

• It provides energy

What is the primary function of soil?

• To provide energy

• To support plant growth

• To store water

• To produce oxygen

What percentage of the world's surface is covered by forests?

• 32-35%

• 20-25%

• 10-15%

• 40-45%

What is the recommended forest cover for a country?

• 10-15%

• 20-25%

• 30-35%

• 40-45%