Which statement about lightning is true?
a. it is one of the most dangerous parts of a thunderstorm.
b. it is an electric discharge between two similarly charged surfaces.
c. it is caused by the rapid expansion of air along an electrical strike.
d. it always begins in a cloud and strikes the earth.

The best statement that describes lightning is A. It is one of the most dangerous parts of a thunderstorm. Lightning, although often thought to always strike the Earth, can actually occur in the same cloud (intracloud) and between clouds (cloud to cloud). It is caused by the electrostatic discharge between charged particles in the atmosphere.

B.) nitrogen fixationnitrogen fixation is the process of nitrogen molecules seeping into the soil and inside plant roots and bacteria. it gives more "life" to plants