Put the following in the correct chronological order from what happened first to what happened last.

1. Thought everything revolves around the sun but could not prove it.

2. Thought everything revolves around the Earth.

3. Analyzed the data that was gathered by another astronomer about the movement of the planets and proved that the orbits are elliptical.

4. Proved that the planets revolve around the sun by making observations.

2-3-1-4

Explanation:

The astronomer Nicolaus Copernicus did not have a theory about the Earth revolving around the sun until he got into astronomy and began to study the patterns of the sun and the moon as well as reading other entries from previous astronomers. You can pretty much guess from there, he had to have the theory before proving it etc.  

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.