JUST READ IT ITS NOT THAT HARD PLUS ILL GIVE BRAINLIEST

Read the passage.

The northern lights are an amazing spectacle that can be seen in the sky near the North Pole. They occur when charged particles from solar storms are released into space from the sun and crash into gases in the Earth’s atmosphere. The charged particles excite atoms and molecules in the gases. When the atoms and molecules become excited, they release light and produce glowing bands of color on the horizon. Different gases release different colors. For example, nitrogen sends out blue or purplish-red light, while oxygen usually gives off green light.

What is the author’s purpose in writing this passage?

to explain why the sky changes colors
to describe the causes of the northern lights
to list the different gases that make up the sky
to tell a personal story involving the northern lights