When the solar wind collides with atoms and molecules in earth's upper atmosphere, what is created?
a. auroras
b. neutrinos
c. radio waves
d. x-rays and gamma rays

Zac wanted to determine the measure of r and of ? r in the triangle below. to fine the measure of r, zac sets up the problem.42^2 + 24^2 = r 2. determine whether zac set the problem up correctly.