Unit 2

The Earth's ______ is rising due to climate change.

• temperature

• location

• shape

• size

Rising ______ threaten coastal cities.

• sea levels

• mountain heights

• desert areas

• riverbanks

Pollution can disrupt entire ______, affecting many species.

• ecosystems

• buildings

• vehicles

• highways

Global warming is causing ______ to bleach and die.

• coral reefs

• forests

• deserts

• mountains

Carbon dioxide and methane are examples of ______.

• greenhouse gases

• fresh air

• clean energy

• minerals

The Earth's ______ protects us from harmful solar radiation.

• atmosphere

• ocean

• core

• crust

Coal, oil, and natural gas are examples of ______.

• fossil fuels

• clean energy

• freshwater sources

• recycling methods

Solar and wind power are forms of ______.

• renewable energy

• pollution

• waste

• deforestation

______ panels convert sunlight into electricity.

• Solar energy

• Gasoline

• Plastic

• Paper

Dams generate ______ using the power of moving water.

• hydroelectric energy

• coal energy

• nuclear waste

• oil reserves