Which of the following is an example of convection? a hot oven warming the air around it a hot object transferring heat to a cooler one hot air rising and cooler air falling the rays of the sun warming the earth

hot air rising and cooler air falling

These are called "convection currents", the currents being air currents which carry heat because they are hot air - rises - and cold air - sinks. Also may explain coastal land and sea breezes. As "thermals" convection currents may help aeroplane gliders and birds to fly by "hitching a ride on the nearest convection current" as it were

Because shotguns bullets ricochet