Which best explains heating by convection?

a) air molecules touch the warm ground, heating them up.

b) warm air rises and takes heat with it; eventually it cools and sinks

c) sunlight travels through space without the aid of fluids or solids.

d) land and ocean absorb and re-emit heat from the sun

Based on anatomical similarities, to which modern animal is dr. digger’s creature most closely related?

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic

You and a group of friends are spending your vacation hiking through the mountains. it is cold in the mountains. you will be expending a lot of energy while hiking and you will need plenty of energy to keep you warm. you should pack foods high in to provide the most energy or kilocalories per gram of food. a) carbohydrates b) lipids (fats) c) proteins d) sugars