Relative and Absolute Dating Crossword Puzzle

QUESTIONS LIST: isotopes : these are tiny invisible ingredients inside a rock, nitrogen 14 : formed when carbon-14 decay, absolute dating : provides actual numerical ages, often in years, superposition : allows geologists to establish a temporal sequence of events based on the arrangement of sedimentary rock layers, faunal succession : says that different types of fossils appear in a predictable order in the rock layers, horizontality : this principle asserts that sedimentary rock layers, when first formed, were originally deposited in horizontal or nearly horizontal positions, radioactive decay : the key principle behind absolute dating, cylindrical cores : extracted or drilled when doing ice core dating, luminescence dating : kind of like a glow-in-the-dark effect, relative dating : useful for establishing sequences of events but not exact ages, half life : the measurement used by scientist to measure how long it takes for half the parent isotopes change into daughter isotopes, nicholas steno : proponent of original horizontality, dendrochronology : scientists can learn about the tree's adventures over the years, cosmogenic nuclide : created due to continuous bombardment of cosmic rays to the surface of the earth, inclusion : the rock containing the fragments must be younger than the fragments themselves