From what you've learned in this lesson, why is it possible for the surface of a pond to freeze even though the water underneath is fluid?

The water below the surface is much more dense

Explanation:

The surface is the first to freeze as it is closest to the cold air, therefor the temperatures affects the surface much quicker than below it. This is because of the density, and it takes longer to fully freeze or even alter the temperature of a large amount of water.

you are the source of the heat energy. you can minimize the heat energy by selecting the appropriate clothes to wear.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.