What is an element? select one: a. two or more atoms held together by chemical bonds b. a chemical that cannot be broken down or separated into other chemicals c. a chemical that can be broken down or separated into other chemicals d. one or more molecules held together by chemicals e. a chemical that cannot be separated, but is limited in supply?

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?