What is the main reason why most lava flows aren't a threat to human life? a. Lava flows rarely move into inhabited areas. b. Lava flows usually don't flow very quickly, so people can outrun them. c. Lava stays in the volcano and generally doesn't flow. d. Lava flows are not hot enough to kill people.

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes

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.