The Cretaceous-Tertiary event is the largest mass extinction in the Earth\'s his
ID: 298879 • Letter: T
Question
The Cretaceous-Tertiary event is the largest mass extinction in the Earth's history. Soft parts fare easily preserved as fossils within sediments. Fossils are usually found in igneous rocks. Fossilization is a rare occurrence. Arthur Holmes proposed continental drift. The meteor responsible for the K/T extinction was approximately 6km in diameter The longest era in geologic time is the Cenozoic. The first time period on the geologic time scale is the Hadean. Approximately 35% of species became extinct at the Permian-Triassic mass extinction. Isotopes of an element have varying numbers of neutrons.Explanation / Answer
1) the cretaceous-tertiary extinction is the largest extinction of the earths surface
Answer: True
Overall, approximately 80 percent of all animal species disappeared, making this one of the largest mass extinctions in earth’s history.
2) soft parts are easily preserved as fossils within sediments
Answer: False
In rare circumstances, preservation of the soft parts of an organism may occur.
3) ususally fossils are found in which rocks
Answer: False
Most fossils are found in sedimentary rock, which is the most common type of rock.
4) fossilization a rare occurance
Answer: True
Fossilization is an extremely rare event
5) arthur homes proposed continental drift
Answer: False
Arthur Holmes proposed that convection currents in the Earth
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