sentence: Cold air becomes thicker and falls, and warm air becomes thinner and goes up.
sentences_before: Rain and storms are both in this level. Both come about because this part of the air gets colder as it goes up.
sentences_after: The turning Earth moves the air as well and air moves north and south because the middle of the Earth generally gets more power from the Sun and is warmer than the north and south points.
concept_name: cold air
headings: Earth What it is made of Air
categories: Geology