Question

a hydrothermal vent transfers heat using...
convection
absorption
reflection
conduction
radiation

Explanation:

Hydrothermal vents are underwater fissures. Convection is the transfer of heat through the movement of fluids (liquids or gases). In hydrothermal vents, hot water (a fluid) rises and cooler water moves in to replace it, creating a convective current. Absorption is about a material taking in energy. Reflection is bouncing back of waves. Conduction is heat transfer through direct contact (like a pan on a stove). Radiation is heat transfer via electromagnetic waves (like the sun's heat reaching Earth). Hydrothermal vents' heat transfer is due to fluid (water) movement, which is convection.

Answer:

Convection