61 Journal #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.
62 Faultsare breaks in the earth’s crust. A fault is always younger than the rock it cuts through.
69 Draw 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.
70 Unconformitiesare gaps in the rock sequence (caused by the erosion of rock layers).
71 Angular 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.
106 Draw 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.
107 Paleontology 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”
108 Absolute Ageis the age in years of a rock or other object (as determined by radiometric dating.
109 Radiometric Datingentails finding the amount of certain radioactive elements left in a rock or object.
110 Radioactive Decayis the release of particles and energy from the nuclei of unstable atoms.
111 Radioactive Elementsare elements whose nuclei are unable to hold together, and eject particles and energy.
112 The Parent Elementis the element whose nucleus radioactively decays into another element.
113 The Daughter Elementis the new element that is produced after the decay of the parent element.
114 Half-Lifeis the time it takes for half of the atoms in a sample to decay.
115 Half-Lifeis always the same. It does not depend on the amount of atoms.
116 Half-Lifeis unaffected by almost all other outside factors. Decay occurs at a steady rate.