Greenhouse Effect and Climate Change

Why is the greenhouse effect important for Earth?

• It makes Earth too cold.

• It keeps Earth warm enough for life.

• It makes Earth too hot.

• It has no effect on Earth.

What happens to light when it enters a greenhouse?

• It stays outside.

• It turns into sound.

• It disappears.

• It is reflected and some is trapped as heat.

Which gases are important for trapping heat in the atmosphere?

• Argon and krypton

• Carbon dioxide and methane

• Nitrogen and oxygen

• Helium and neon

What has caused the increase in greenhouse gases since 1750?

• More rain

• Less sunlight

• Industrial activities

• More trees

What happens when ice melts on Earth?

• It makes Earth colder.

• It absorbs more light and increases heat.

• It has no effect.

• It turns into clouds.