Armstrong's first footprint is still visible on the surface of the Moon. We know this even though no one has returned to the moon in over 30 years. How can we know this for sure?

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.

they dont have any evidence

if you listed your answers right then i believe your answer is b.

dont know just give me brainliest