What goes on at the center of the earth?

Which geologic feature would most likely be represented by contour lines john far apart from one another? a cliff a hill a plain a valley

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

One of the purposes of transcription is to produce a sequence of bases that