Shania is trying to determine the oldest geologic unit on this map. why is she unable to do so? there are only three units. there is no key on the map. the text on the map is too small. the units are all the same age.

What kind of simple machine is a catapult?

Which best describes the difference between internal and thermal energy?

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?