Lab 7 Process of Science-Extraordinary Claims: The Death of the Dinosaurs Was Ca
ID: 287930 • Letter: L
Question
Lab 7 Process of Science-Extraordinary Claims: The Death of the Dinosaurs Was Catastrophic, Not Gradual ) 3of10 Learning Goal: To understand the evidence indicating that the extinction of the dinosaurs was caused by an impact Introduction. Bead the Extraon nay Claims text around which this tutorial is fooused. You may also wish to review sections of your toxbook relevant to the cain Part A Prior to the time when Luis and Waiter Alvarez proposed that an impact led to the extinction of the dinosaurs, it was generally assumed that the dinosaurs had died out ovar a period of at least thousands to milions of years Consc each piece of evidence listed below and sort i into the oomect bin based on whether it supports a sudden cause for the demise of the dinosaurs or whether ia could also be consistent with a gradusl caune leading to ther dermise over many thousands or more years. Note: The "K-T sediment layer" refers to the geological layer dating to about 65 million years ago that separates sediments thet contain dinosar tos fomhos hat o nat conitains grains K-T sediment layer is shocked quart evidence of volcanic eruptions around ange impact craner has same age asmany dnosau of IK T sediment layer K-T sediment layer contairs soet Also consistent with gradual cause Only supports sudden cause SubmitExplanation / Answer
ONly supports sudden cause:
-KT sediment layer rich in iridium.
-no dinosaur fossil above KT layer
-KT sediment layer contains grains of shocked quartz.
-evidence of volcanic eruptions around time of KT sediment layer
-large impact crater has same age as KT sediment layer
-KT sediment layer contains soot.
Also consistent with gradual case:-
-many dinosaur fossils in and below KT sediment layer
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