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Earth's History

TermDefinition
Radiometric Dating A method to determine the age of rocks & fossils
Radioactive Elements They breakdown/decay to become stable, releasing radiation/excess energy
Half Life Time it takes for half a sample to decay into something stable
Carbon-14's Half-Life 5,730 Years
Stable Decay Product Nitrogen
How Many Half Lives the Fossil Has Been Through The ratio of carbon-14 to its decay product in fossils
Carbon-14 Dating Range 100-30,000 years old
Potassium-40 Dating Range 100,000-4.5 billion years old
Rubidium-87 Dating Range 10 million-4.5 billion years old
Uranium-238-235 Dating Range 10 million-4.6 billion years old
Coastal Plain Atlantic Ocean on the East & Fall Line on the West
Coastal Plain Geology -Sedimentary- left from Appalachian Mountain erosion -Youngest of VA (~200-170 million years ago) -Off-shore oil drilling & Off-shore wind
Estuary Where freshwater meets the ocean- most biologically active
Piedmont East of Blue Ridge Mountains & West of Fall Line
Piedmont Geography -Metamorphic -Pre-Cambrian age -Fossilized dinosaur footprints
Blue Ridge -Narrow line of mountains north of Roanoke -Oldest mountains in VA -Appalachian mountains are more weathered than the Rocky Mountains
Blue Ridge Geography -Igneous & Metamorphic -Mid-Proterozoic through Cambrian -No fossils
Valley & Ridge -An area of long, parallel ridges separated by valleys -Folding & faulting occurred during the formation of the Appalachian Orogeny
Appalachian Orogeny When North America collided with Africa & Europe
Valley & Ridge Geography -Sedimentary -Paleozoic -Fossils: shells
Appalachian Plateau -Series of plateaus separated by faults -Known for rich deposits of coal & oil
Appalachian Plateau Geography -Sedimentary -Paleozoic (late) -Fossils: swamp plants
Geologic Timescale Early Pre-Cambrian~ Late Pre-Cambrian~ Early Paleozoic~ Late Paleozoic~ Mesozoic~ Cenozoic
Created by: whoisalanaprice
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