G6 Reviewer for Final Test

What happens when more people need food, water, and land?

• Resources are used faster

• Pollution disappears

• Forests grow bigger

• Animals increase

Large cities often create more:

• Fresh air

• Waste and pollution

• Forests

• Wildlife habitats

Which activity can make the air dirty?

• Riding bicycles

• Burning gasoline

• Planting trees

• Recycling paper

Dirty water can harm:

• Fish and plants

• Clouds

• Rocks

• Wind

Throwing trash on the ground causes:

• Land pollution

• Water cycle

• Condensation

• Evaporation

Biodiversity means:

• Different kinds of living things

• Only plants

• Only animals

• Only insects

Ecosystems are healthier when they have:

• Many species

• One species

• No plants

• Few animals

Animals that may disappear forever are called:

• Common species

• Threatened species

• Farm animals

• Domestic species

Removing too many trees from forests is called:

• Reforestation

• Deforestation

• Conservation

• Recycling

One effect of cutting down forests is:

• Habitat destruction

• Cleaner air

• More biodiversity

• Less erosion