At night the sand cools off...
Conduction
Convection
Or radiation

I feel like it's Convection because if its dry , then the water comes over it and it warms it also the sun gives it light it's gonna be more warmer. So I think your answer will be Convection.

Explanation:

Because conduction is Anything being warmed by objects touching.

And radiation is Anything being warmed by heat transferring through space.

And the meaning of Convection is Anything being warmed in WATER.

I hope this is right and I hope this will help you in any way!! <3

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

overcharge is the right answer system