In the united states, most of our energy comes from this non-renewable resource, which has a negative effect on the environment: select one: a. coal b. nuclear c. natural gas d. petroleum i think it is a. coal but i am not sure

D. Earth's Magnetic field

Explanation:

The Earth's magnetic field affects a compass to where the arrow is always pointing towards the north and south. The North and South pole's have a stronger magnetic field that effects direction of the arrow in the compass, hence why a compass' arrow is always made out of a metal or other magnetic material.