Oscillations of electricity and magnetism create waves, which include visible light waves.

Explanation:

radio waves, which include visible light waves.

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this