Greenhouse effect

The video explains how heat is retained close to a planet's surface, making the surface and lower atmosphere warmer than if only direct sunlight was the warming mechanism. Without this effect, Earth's average surface temperature would be around -19°C.

What is the effect of heat being retained close to a planet's surface?

• It has no effect on the planet's temperature.

• It makes the surface and lower atmosphere warmer.

• It causes the surface and lower atmosphere to cool down.

• It only affects the upper atmosphere.

Which of the following is NOT a warming mechanism for Earth?

• Greenhouse gases

• Heat retention near the surface

• Direct heating from the sun

• Volcanic eruptions

How does the sun's direct heating compare to other warming mechanisms?

• It is the only mechanism that warms the Earth.

• It is less significant than other mechanisms.

• It is the most significant mechanism.

• It has no impact on Earth's temperature.

What would Earth's average surface temperature be without the warming mechanism?

• Around 0°C

• Around -19°C

• Around 25°C

• Around 15°C

Why is the warming mechanism important for Earth's climate?

• It prevents the Earth from becoming too hot.

• It has no significant impact on climate.

• It ensures the Earth is warmer than -19°C.

• It keeps the Earth's temperature stable.