Heating the earth?

Question

1. which is the only part of sand or soil that is heated up during the day

2. how does this effect how much it heats up and cools down?

Answer 1

which is the only part of sand or soil that is heated up during the day- the part exposed to the sun heats up more

how does this effect how much it heats up and cools down?- the Sun's radiation is what affects how much it heats up and cools down (absence of the sun whether by night or clouds).