Final answer:
Water has higher specific heat than other materials, which leads to higher summer temperatures in San Antonio compared to Galveston due to the molecular properties of water.
Step-by-step explanation:
Water has higher specific heat than other materials, which means it absorbs or releases more heat for the same change in temperature. The temperature in San Antonio is hotter in the summer than in Galveston because of the molecular properties of water. The bodies of water surrounding San Antonio, such as rivers or lakes, have a larger heat capacity compared to the ocean surrounding Galveston. This means that it takes more energy to raise the temperature of the bodies of water in San Antonio, resulting in higher summer temperatures.