Which statement best describes heating by conduction? 1. Sunlight travels through space without the aid of fluids or solids.

2. Air at the equator rises and sinks at the poles.

3. Air molecules touch the warm ground, heating them up.

4. Warm air rises and takes heat with it; eventually it cools and sinks.

(If you want brainliest please explain why the answer is that answer)

It would be A.  Air molecules touch the warm ground, Heating them up because conduction is when a source of energy touches something directly.

3. Air molecules touch the warm ground, heating them up.

Explanation:

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.