Question

why does temperature usually decrease as elevation increases? a) air becomes thinner and holds less heat at higher altitudes b) mountain ranges block warm winds at the base c) higher elevations are closer to the sun but absorb less energy d) air pressure is stronger at the top of mountains

Explanation:

• Option A: As elevation increases, air density decreases (air becomes thinner). Air molecules are less able to retain heat, so temperature drops. This matches the scientific explanation of atmospheric temperature - altitude relationship.
• Option B: Mountain ranges blocking winds at the base doesn't explain the general temperature - elevation trend globally, as it's a local topographical effect.
• Option C: The distance to the sun change with elevation is negligible. The sun's energy absorption isn't the main reason for temperature decrease with elevation.
• Option D: Air pressure decreases with increasing elevation, not becomes stronger. So this is incorrect.

Answer:

A. Air becomes thinner and holds less heat at higher altitudes