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Earth Science U4

QuestionAnswer
Original Horizontality undisturbed sedimentary rock remains in horizontal layers
Disconformity horizontal layers of old sedimentary rock erode, then get covered by new layers
angular unconformity folded or tilted rock comes to the surface, erodes, and new sediment is deposited
law of superposition a sedimentary rock layer is older than the layers above it and younger than the layers below it
nonconformity sedimentary layer over unstratified rock
half-life the time it takes for half of a sample of a radioactive isotope to decay
radiometric dating determining age through comparison of isotopes
varve boundary between two sedimentary rock layers
law of intrusive relationships any igneous intrusions must be younger than the rock they intrude through
Law of faunal succession sedimentary layers containing fossilized plants and animals can be put in relative order based upon the vertical succession of the fossils over large distances
Order of geologic history... eon, era, period, epoch
Era of the age of mammals cenozoic
era of the age of reptiles mesozoic
In rock layers, according to the law of superposition, the oldest rocks... are on the bottom
period that began 65.5 million years ago and ended 1.6 million years ago tertiary
period that began 245 million years ago and ended around 208 million years ago triassic
period that began 1.6 million years ago and is currently going quaternary
A rock layer in Ireland that is Identicale to a rock layer in Virginia means... the rock layers formed at the same time and are the same age
when identifying the age of rock layers with a picture, you are using... relative aging
if a palm leaf is found in an artic tundra of Canada what does it say about the past climate that northern Canada used to have warmer, more humid environment
When scientists put rock layers in order from youngest to oldest, this is an example of absolute dating... (T or F) False
When a scientist uses half-lives to calculate how much of an element is in a rock layer, this is an example of absolute dating True
what makes something a good index fossil it must have lived for a short period of time and be widely distributed
what is radiometric dating a method for dating rock using the decay of radioactive isotopes
why is radioactive decay used to determine the absolute age of rocks radioactive decay happens at a relatively constant rate
How old is the earth 4600 million years
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