Air has a lower specific heat then water once the sun goes down will the air or the water cool faster? What is the independent and dependent variable

Dependent variable: A dependent variable can be described as the one which is dependent on the independent variable. It can be described as a variable which is under observation or the variable on which experiments is being made.

An independent variable can be described as a variable which is not dependent on any factor. Changes in the independent variable bring changes in the dependent variable.

The independent variable is the Sun and the dependent variable is the specific heat capacity. As air has lower heat capacity, hence it will cool faster than water.