The weather forecast in Tonga is 7 days a week.

A: A city is Nanping and B city is Xiamen. There are many sandstone in Nanping area, and the specific heat capacity of sandstone is small. Under the same conditions, the temperature of sand and gravel changes greatly, and the daily temperature difference in Nanping City changes greatly. In Xiamen, at the seaside, the specific heat capacity of water is relatively large. Under the same conditions, absorbing (or releasing) the same heat, the temperature of water changes little, so the daily temperature difference changes little.