61Journal #3 Draw the following geologic cross-section: 1.) 2 layers of sedimentary rock form.2.) An extrusion forms on top of the two layers.3.) A 3rd layer of sedimentary rock forms.4.) An intrusion cuts through the all the rock layers, but not to the surface.5.) A 4th layer of sedimentary rock forms.
62Faultsare breaks in the earth’s crust. A fault is always younger than the rock it cuts through.
69Draw the following geologic cross-section: Journal #4Draw the following geologic cross-section:1.) 2 layers of sedimentary rock form.2.) The 2 layers of rock are folded.3.) A 3rd sedimentary layer forms.4.) A fault cuts through all the layers, shifting some rock up.5.) A 4th sedimentary layer forms.6.) An intrusion cuts all the way to the surface forming an extrusion.
70Unconformitiesare gaps in the rock sequence (caused by the erosion of rock layers).
71Angular Unconformityoccur when rock layers are tilted or uplifted, and then worn down by erosion and weathering.Sediments are then deposited on top of these eroded layers.
106Draw a geologic cross-section with the following: Journal #5Draw a geologic cross-section with the following:1.) At least 5 sedimentary rock layers2.) At least 3 cross-cutsWrite a geologic history that explains the order of occurrence of each event.
107Paleontology Notes RETURN YOUR REMOTE Finding Clues to Rock Layers HW: (Pal Pack)p.18 “The Grandest Canyon of All”p.19 “Relative Order of Geologic Events”p. 20 “Geologic Puzzles”
108Absolute Ageis the age in years of a rock or other object (as determined by radiometric dating.
109Radiometric Datingentails finding the amount of certain radioactive elements left in a rock or object.
110Radioactive Decayis the release of particles and energy from the nuclei of unstable atoms.
111Radioactive Elementsare elements whose nuclei are unable to hold together, and eject particles and energy.
112The Parent Elementis the element whose nucleus radioactively decays into another element.
113The Daughter Elementis the new element that is produced after the decay of the parent element.
114Half-Lifeis the time it takes for half of the atoms in a sample to decay.
115Half-Lifeis always the same. It does not depend on the amount of atoms.
116Half-Lifeis unaffected by almost all other outside factors. Decay occurs at a steady rate.