The video tutorial explains the carbon cycle, highlighting carbon's significance in nature and its role in photosynthesis and respiration. It covers the formation of fossil fuels, combustion, and the dual behavior of oceans in carbon absorption and release. The video also discusses carbon's impact on global warming and suggests planting trees and avoiding deforestation as solutions.

What percentage of matter in living things is made up of carbon compounds?

• 10%

• 25%

• 18%

• 30%

Which of the following is the hardest naturally occurring substance?

• Iron

• Graphite

• Diamond

• Coal

What is the symbol for carbon?

• Ca

• C

• Co

• Cr

Which form of carbon is known for being soft and slippery?

• Coal

• Graphite

• Diamond

• Charcoal

What process do plants use to convert carbon dioxide into compounds?

• Photosynthesis

• Decomposition

• Combustion

• Respiration

How is carbon returned to the atmosphere from animals?

• Photosynthesis

• Respiration

• Combustion

• Decomposition

What happens to carbon when plants, animals, or humans die?

• It evaporates

• It is absorbed by the sun

• It becomes fossil fuels

• It disappears

How do oceans contribute to the carbon cycle?

• They both absorb and release carbon

• They have no role

• They only absorb carbon

• They only release carbon

What is the role of carbon as a greenhouse gas?

• It reflects sunlight

• It traps heat

• It absorbs water

• It cools the earth

What is one way to mitigate the effects of carbon on global warming?

• Increase deforestation

• Reduce oxygen levels

• Burn more fossil fuels

• Plant more trees