Regions on the surface of the Sun often flare and give off ultraviolet light and x-rays that heat up the Earth's upper atmosphere.
(Regions on the surface of the Sun; flare; T:often) (Regions on the surface of the Sun; give off; ultraviolet light and x-rays that heat up the Earth's upper atmosphere; T:often) (ultraviolet light and x-rays; heat up; the Earth's upper atmosphere)
Regions on the surface of the Sun Regions on the surface of the Sun ultraviolet light and x-rays
flare give off heat up
T:often
ultraviolet light and x-rays that heat up the Earth's upper atmosphere T:often
the Earth's upper atmosphere