What is the greenhouse effect?

• A cooling of Earth's surface

• A type of greenhouse

• A warming of Earth's surface

• A type of plant

Which gas is NOT a greenhouse gas?

• Methane

• Water vapor

• Carbon dioxide

• Oxygen

What happens to sunlight when it enters Earth's atmosphere?

• All of it is reflected back into space

• All of it is absorbed by the atmosphere

• Some is reflected, some heats Earth's surface

• It disappears

Which planet has an extreme greenhouse effect?

• Mars

• Venus

• Jupiter

• Earth

What is the main cause of increased greenhouse gases?

• Natural processes

• Human activities

• Volcanic eruptions

• Animal respiration