Geologic Time Crossword Puzzle

QUESTIONS LIST: relative dating : approximate age given to a rock layer based on it's position, erosion : the process by which wind, water, ice, gravity, or other natural forces move sediment over earth's surface, stratigraphy : study of rock layers to determine geologic history, isotope : an atom of the same element that has a different number of neutrons in its nucleus and, therefore, a different mass, absolute dating : an exact age given to a rock layer or fossil based on it's isotope decay, parent : an unstable isotope, half life : the amount of time it takes for half an isotope to decay, sediment : small pieces of eroded rock that is moved by wind or water,, superposition : law stating that older rock layers are found at the bottom, geologic column : column created to determine age of rocks and fossils, daughter : a stable isotope, radioactive decay : the decay of an isotope