Arift valley can form where two continental plates are
a. moving apart b. colliding

Working with si (metric) units for each of the following commonly used measurements, indicate its symbol. liter gram milliliter kilogram meter centigram milligram centimeter kilometer second millimeter milliseconds

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.