oil, coal, and natural gas

solution containing a lot of solute

carbon dioxide is an example of this

solution containing little solute

pattern of data referring to the concentration of a certain greenhouse gas

the comparison of two or more parts of a whole

layers of gases surrounding the Earth 

Oxygen is the most common gas in the air.

Salt solutions are transparent.

Oceans cover about 71% of Earth's surface.

Water particles have more mass than salt particles.

Astronauts use special filters to remove carbon dioxide from the air in space stations.

Greenhouse gases such as carbon dioxide, do not contribute to the warming of the atmosphere.

Condensed water vapor is a liquid.

A mixture of 20% helium and 80% oxygen lets divers dive below 30m.