The formation of a protective superficial layer of skin cells filled with keratin is called

The answer is keratinization. This is sometimes called as cornification action. It is the development of dead, protective, and superficial layers of cells occupied with keratin. Happens on all bare skin surfaces. Cells transfer from stratum basale to stratum or in other words deep to superficial in a period of 15-30 days.

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answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.