Question

which statement best describes the greenhouse effect?
○ heat is trapped by gases in the atmosphere, warming earth.
○ earth cools because gases block sunlight.
○ rocks absorb heat and release it at night.
○ buildings stay warmer on upper floors.

Explanation:

The greenhouse effect is defined as the trapping of heat by greenhouse gases (like carbon dioxide, methane) in the Earth's atmosphere, which warms the planet. Let's analyze each option:

• Option 1: "Heat is trapped by gases in the atmosphere, warming Earth" matches the definition of the greenhouse effect.
• Option 2: "Earth cools because gases block sunlight" is incorrect; greenhouse gases don't block sunlight (they allow sunlight in but trap outgoing heat).
• Option 3: "Rocks absorb heat and release it at night" describes thermal properties of rocks, not the greenhouse effect.
• Option 4: "Buildings stay warmer on upper floors" relates to heat rising in buildings, not the greenhouse effect.

Answer:

A. Heat is trapped by gases in the atmosphere, warming Earth