How does energy from the Sun reach the Earth across empty space?
ABy conduction
BBy radiation
CBy convection
DBy insulation
Answer & Solution
Correct answer: B. By radiation
1. Conduction needs two things to be touching each other.
2. Convection needs a liquid or gas that can move around.
3. There is neither between the Sun and the Earth, only empty space.
4. Energy still crosses it by radiation, which needs no material at all.
_Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Radiation_