Question

which statement best compares radiation, conduction, and convection?
conduction and convection need matter; radiation can travel through space.
all three need direct contact between materials.
radiation and conduction both require fluids to move.
only radiation happens in earths atmosphere.

Explanation:

• Conduction is heat transfer through direct contact of matter. Convection is heat transfer through the movement of fluids (liquids or gases), which are forms of matter. Radiation is heat transfer via electromagnetic waves and can occur in a vacuum (space).
• Option 2 is wrong because radiation does not need direct contact.
• Option 3 is wrong because radiation does not require fluids to move.
• Option 4 is wrong because conduction and convection also happen in Earth's atmosphere.

Answer:

Conduction and convection need matter; radiation can travel through space.