Water property:
Water can moderate its temperature because of 2 properties: high specific heat and the high heat of vaporization.
High specific heat is the amount of energy that is absorbed or lost by one gram of a substance to change the temperature by 1 degree Celcius.
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Water's high specific heat allows it to absorb a large amount of heat without changing much in temperature, keeping a relatively constant temperature.
Answer: a High specific heat capacity
