Our Changing Earth Part 2 Vocab. Crossword
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
                                              
 
 
Down: 1) the method used for absolute dating 3) theory that states that the gradual shifting of earth's plates causes continents to change their global positions over time4) gaps in the rock record5) the process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element 6) the mathching up of rock layers from different locations7) the stable isotope that results from radioactive decay8) any method of measuring the age of an event or object in years. the actual age for a rock or mineral.11) the time needed for half of a sample of radioactive substance to undergo radioactive decay Across: 2) uses information about rock layers and the fossil record to determine the age relationships between rocks5) the process by which the age of a rock is determined by measuring the amount of radioactive isotopes present in the rock or rock sample.9) the boundary formed by the collision of two lithospheric plates.10) the theory that explains how large peices of the Earth's outermost layer called tectonic plates move and change shape 12) an atomic nucleus that is undergoing decay13) an atom that has the same number of protons(or the same atomic number) as other atoms of the same element do but that has a different number of neutrons(thus a different atomic mass)14) states that the oldest rocks lie on the bottom and the youngest rocks are on top of any undisturbed sequence of sedimentary rocks15) the boundary between two tectonic plates that are moving away from each other.
 

 

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