What are two ways you could reduce the friction between two surfaces?

Calcium chloride +gold(1) oxide—>

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

Can anyone answer these questions? ? i need it before 1: 00pm today