The air we breathe is mostly a mixture of oxygen and hydrogen. How do air molecules change above 100 km? Water vapor condenses from the cold air.

The electrically charged ions in the ionosphere creates turbulence.

Gases are no longer evenly mixed but layered.

Meteors burn in Earth's atmosphere.

The answer is the first option just took the test

Acidichope this  

The surface of the water droplet is held together by the attraction between molecules. in order for water to flow more easily into these small spaces, you need to decrease its surface tension. you can do this by adding soap, which is a surfactant (a material that decreases the surface tension of a liquid).