Relative to other substances, water tends to resist changes in temperature. Why?
1) Water is extremely dense, and like all dense materials, it can absorb a great deal of heat with a relatively small change in temperature.
2) Water is abundant. Large bodies of water resist changes in their temperature simply because they are massive objects.
3) Water is highly cohesive. Its molecules tend to resist increases in their motion. When water is heated, some of the energy is used to disturb the hydrogen bonds between neighboring molecules.
4) Water is highly adhesive. Pure water does not resist temperature change, but if water is bonded to other substances, molecules will tend to "stay put" and resist increases in their motion.