reaction / hydrocarbons / mixture

Crude oil is a of many different compounds. Most of the compounds are .

How crude oil was made:

dinosaurs / plankton / pressure / buried / thousands / millions

1. Crude oil is formed from the remains of dead plants and animals, particularly .
2. These organic remains were covered by mud and sand, and in the earth.
3. Over of years, these organic remains were compressed under a lot of heat and pressure.
4. The heat and chemically changed the organic remains into crude oil.

How fractional distillation works:

condense / boiling / cool / warm / longer / shorter / gas / liquid / high / low

1. Crude oil is a mixture of hydrocarbons with different points.
2. The first step is to heat the crude oil to a very temperature so that all of the compounds are evaporated from liquid to .
3. The hot gaseous hydrocarbons then rise up the fractionating column (because hot gas rises).
4. As they rise, they down, because the top of the column is cooler than the bottom. 
5. The hydrocarbons will when they become cooler than their boiling point, and the liquid hydrocarbons then collect in trays and drain out.
6. The chain hydrocarbons condense at the bottom of the fractionating column because they have high boiling points.
7. Meanwhile the chain hydrocarbons condense at the top of the column because they have much lower boiling points. 

Match the hydrocarbons A to C on the diagram above with the following products:

Petrol:

Liquified Petroleum Gas:

Bitumen: