Question

What is the purpose of greenhouse gases?

• A. They keep the Earth cold.
• B. They reflect the harmful UV rays from reaching the surface.
• C. They keep the Earth warm.
• D. They radiate radio waves.

Answer 1

The correct option is C They keep the Earth warm.

The Earth's surface temperature could be as cold as $-{18}^{\circ }C$ without the greenhouse gases. The greenhouse gases trap heat from the Sun and radiate within the layer, making life sustainable on the planet.