Unit 1: Save Our Planet!

What's the meaning of the word carbon dioxide?

• animals, birds, and plants living in their natural environment
• a gas that is produced when people and animals breathe out, or when carbon is burned
• water, especially from a river or stream, dropping from a higher to a lower point, sometimes from a great height
• a high area of rock with a very steep side, often on a coast

What's the meaning of the expression endangered species?

• animals or plants that may soon not exist because there are very few now alive
• a forest in a tropical area which receives a lot of rain
• a part of the coast where the land curves in so that the sea is surrounded by land on three sides

What's the meaning of marine life?

• the plants and animals that live in the sea
• a part of the coast where the land curves in so that the sea is surrounded by land on three sides
• an area of low land between hills or mountains, often with a river running through it

What's the meaning of the word pollution?

• used to make a suggestion
• damage caused to water, air, etc. by harmful substances or waste
• water, especially from a river or stream, dropping from a higher to a lower point, sometimes from a great height

What's the meaning of the environment?

• used to make a suggestion that almost always works
• a small river that flows on or below the surface of the ground
• the air, land, and water where people, animals, and plants live

What's the meaning of the word waste?

• unwanted matter or material of any type, often that which is left after useful substances or parts have been removed
• a very large piece of ice that floats in the sea
• the plants and animals that live in the sea

What's the meaning of climate change?

• a gas that is produced when people and animals breathe out, or when carbon is burned
• the way the Earth's weather is changing
• an area of low land between hills or mountains, often with a river running through it

What's the meaning of the word energy?

• the power that comes from electricity, gas, etc.
• the way the Earth's weather is changing
• an area of low land between hills or mountains, often with a river running through it

What's the meaning of the word oxygen?

• the plants and animals that live in the sea
• a forest in a tropical area which receives a lot of rain
• a gas that is in the air and that animals need to live

What's the meaning of solar power?

• energy that uses the power of the sun to produce electricity
• a forest in a tropical area which receives a lot of rain
• a gas that is produced when people and animals breathe out, or when carbon is burned