Activation energy is
the heat released in a reaction
the energy given off when reactants collide
generally very high for a reaction that takes place rapidly
an energy barrier between reactants and products

Which of these describes how heat is transferred by convection* a. sunlight travels through space without the aid of fluids or solids. b. warm air rises and takes the heat with it, eventually, it cools and sinks c. air at the equator rises and sinks at the poles. d. air molecules touch the warm ground, heating them up *not conduction