Match the words with the definitions.

Write the number of the definition near the word.

A process [ ]

Carbon dioxide [ ]

An equation [ ]

To suck [ ]

1. The act of considering one thing to be the same as or equal to another.

2. A series of actions that you take in order to achieve a result.

3. To pull in liquid or air through one's mouth without using one's teeth.

4. The gas formed when carbon is burned, or when people or animals breathe out.