Geological Time Layers Crossword Puzzle

QUESTIONS LIST: fossils : prehistoric remains, time : it's relative, scale : used to weigh things, isotope : same number of protons in the nucleus, sedimentary : the material from a liquid that settles to the bottom, physical : opposite of spiritual, radioactive : used to date rocks, death : final stage of life, carbon : element with atomic number 6, proton : positive, and found in a cell, graphite : found in pencils, nucleus : control center of a cell, evolution : theory of how things came to be, chemical : a compound or substance, geological : relates to the study of earths physical structure and substance, billions : how many years old the earth is, layers : an onion has _ , canyon : grand _ .