Geologic evidence shows that earth's tectonic plates can move thousands of kilometers across the earth's surface. these movements a. do not change the earth's surface at all. b. occur gradually over millions of years. c. occur due to human activity. d. occur in one sudden movement.

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.