Which statement is not true of ozone? a. it is a form of oxygen. b. it is an ingredient in smog. c. it produces ultraviolet radiation. d. it forms a layer in the upper atmosphere.

The correct answer is option (c). It produces ultraviolet radiations.

Explanation:

The ozone is a thin layer present in the stratosphere layer of  the atmosphere. Each molecule of ozone is made up of 3 oxygen atom. The ozone layer is mainly responsible for inhibiting the ultraviolet rays to enter in the earth's atmosphere. The ozone layer is not at all involved in the production of the ultraviolet rays. Hence, the statement ' it produces ultraviolet radiation' is incorrect about the ozone layer.

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.