Question

what causes the northern lights? a radiation particles b earths gravity c magnetic fields

Explanation:

The Northern Lights, or aurora borealis, are caused by charged - particle collisions. Solar radiation particles interact with Earth's magnetic field and atmosphere. Earth's gravity is not responsible for the Northern Lights. Magnetic fields guide the radiation particles, but it is the radiation particles that are the main cause when they collide with gases in the atmosphere.

Answer:

A. radiation particles