(2009? In hot summer, it is much cooler for Xiaoxue to go boating on the lake than walking on the concrete floor. Although the lawn in the park is watered, the grass is still very small.

(1) Because of the large specific heat capacity of water, water with the same mass absorbs the same heat than sand, and the temperature of water rises less, which makes the temperature on the lake lower than that on the cement floor, so it is much cooler to row on the lake than to walk on the cement floor.

(2) Because the lawn area is large, the water meter area increases, and evaporation is accelerated, which makes the grass wither easily;

(3) Sweep the fallen leaves back to their original roots to slow down the air flow and evaporation on the soil surface.

So the answer is: (1) specific heat capacity;

(2) fast;

(3) Slow down the air flow and evaporation on the soil surface.