Fossil Fuels, Human Activity, and The Carbon Cycle (Part 3)

Name

What is the main reason why the amount of carbon dioxide in the air is increasing?

• Plants are taking in more carbon dioxide than they used to.
• Humans are releasing carbon dioxide faster than the Earth can absorb it.
• The oceans are releasing more carbon dioxide than they used to.
• Animals are breathing out more carbon dioxide than they used to.

What happens when we burn fossil fuels?

• We release carbon dioxide into the air.
• We create more plants and animals.
• We clean the air.
• We make the Earth cooler.

What is one way to reduce our reliance on fossil fuels?

• Burning more fossil fuels.
• Using more cars.
• Using renewable energy sources like solar and wind power.
• Cutting down more trees.

What is the main reason why the Earth's climate is changing?

• The Earth is getting older.
• The Earth is getting closer to the sun.
• Humans are releasing too much carbon dioxide into the atmosphere.
• The Earth's rotation is slowing down.

What is the main difference between how humans and plants affect the carbon cycle?

• Humans release carbon dioxide much faster than plants.
• Plants release carbon dioxide much faster than humans.
• Humans and plants both release carbon dioxide at the same rate.
• Humans and plants do not affect the carbon cycle.

Why is it important to reduce our emissions of carbon dioxide and other greenhouse gases?

• To make the Earth colder.
• To make the Earth warmer.
• To protect the Earth's climate and environment for future generations.
• To make the air cleaner for animals to breathe.

What is one way that carbon is stored in the Earth for a very long time?

• In the air we breathe.
• In the food we eat.
• In rocks.
• In the clothes we wear.

What is the main reason why carbon dioxide is considered a greenhouse gas?

• It makes the Earth colder.
• It traps heat in the atmosphere.
• It makes the air cleaner.
• It makes the Earth spin faster.

What is one way that humans are changing the carbon cycle?

• Planting more trees.
• Building more houses.
• Burning fossil fuels.
• Eating more vegetables.