In summer, the weather is sunny. At noon, Xiaoming walked barefoot on the beach by the sea and felt the sand was very hot. When he jumped into the sea, he felt that the sea was very cold.

(1) Because the specific heat capacity of sand is smaller than that of seawater, it absorbs the same heat, and the sand of the same quality heats up faster than seawater, so Xiao Ming feels that the sand burns his feet and the seawater is cold.

(2) Because the specific heat capacity of water is greater than that of soil and sand, at night, the heat released by land and seawater is the same, and the temperature of seawater drops slowly; After the land releases heat, the temperature drops rapidly, and the hot air on the sea surface rises, so the wind blows from the land to the sea surface, forming a land wind.

So the answer is: large specific heat capacity; Landwind.