Described as invisible in the opposite of gravity

Normal Force

Explanation:

Invisible Forces covers the topics of magnetism and static electricity, two invisible yet powerful forces that children experience, often unwittingly, every day. Its focus is non-contact forces, that is, forces that can affect objects without touching them. It also looks at current electricity as a source of magnetism. The opposite of gravity is called normal force, which is denoted by “R” or “N”. According to Newton's 3rd law every action has an equal & opposite reaction.

for e2020. the answer would be some directions from the mountain range so we can find mt. whitney. to locate which direction is north, you should use a   compass. this would not only find mt. whitney, but also becuase of this long paragraph you would get points because it's not like anyone actually reads your work becuase once they read the first sentence it sounds dumb enough to not read becuase i'm not good at answering this but the answer is compass for your benefit.

for e2020 ; -;