(Demo)

Notions

high plain – a plain high above the sea level, formed by the wear of the mountains

D

depression – a plain that is below sea level

E

electron – a negatively charged particle belonging to an atom or moving freely, having a charge exactly equal to −1 elemental charge and a mass about 1000 times less than the mass of a proton
elementary charge – the smallest charge found in nature; proton and electron charge

F

free electrons – electrons that are not part of the atom and can move freely in matter

L

lowland – a plain with absolute altitude below 200 m

P

plateau – a plain higher than the surroundings, an area that has been flat for a long time
proton – particle that is in the nucleus, has +1 elementary charge and a mass about 1000 times the mass of an electron

T

to ground – connecting a charged body to Earth using an electrical conductor (metal wire)

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