The energy from the Sun adds energy to the molecules of the outermost layer of sand, which radiates infrared energy and also conducts thermal energy down into the sand.
The sand is so hot at the beach because it has been sitting in the sun all day, and has been absorbing all of the heat form the sun.
Heat is transferred by thermal conduction.
Heat is transferred from sand to towel to body by conduction because of direct contact.
Conduction
First radiation from the sun then you have conduction from the hot sand
Heat is transferred by thermal conduction.
Endothermic. The sand is absorbing heat. If it was radiating heat, that would be exothermic.
Convection
Yes, if lightning strikes sand (as on a beach), the intense heat of the lightning strike can fuse the sand into glass.
1) Sand has less specific heat, 2) It doesn't mix so easily, so the heat basically stays at the surface.
The sand on the beach absorbes the heat from the sun, is harder to absorbe heat in the ocean because its constantly moving && it has diff. temps everywhere.
One example is the sun warming your face. Heat is transferred from the sun to your face. Another example is the fire in the fire place warming your hands.Heat is transferred from the fire to your hands. Another example is when you lay your towel on the sand. Heat is transferred from the sand to the towel. Another example is the fire heating up the stove. Heat is transferred from the fire to the stove. The last example is the light bulb warming your face. The heat from the light bulb is transferred to your face.
Beach sand can be in hottest condition but cannot hold it for long period. Dark soils such as potting soils can hold it for long time.