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8Sci_Fossils/ Rocks

Fossils, Rocks & Geology (Mr. Tabat)

What did scientists drill out to help them reconstruct Earth's history? rock and ice cores
What process involves the comparison of rock layers with others in a sequence to determine its age? relative dating
What is O-18:O-16? the element isotope ratio Climate Scientists use as proxies to determine past climate changes on Earth
What method is used to determine the most accurate and precise age of Earth's oldest rocks? the uranium-lead method
What are isotopes? the same element with different atomic masses
What is one of the major causes of missing rock layers in unconformities? erosion
What does a scientist need to know to figure out the absolute age of a rock? the rate of decay for a radioactive element in the rock
What could be used as evidence that a volcanic eruption occurred at a particular time in the past? sulfates and ash in rock or ice cores
What is an eon? the largest division of geologic time
What geologic time period ended with the largest mass extinction in Earth's history? Permian
What would provide the most evidence about the geologic history of the Earth? studying sedimentary rock layers
What phrase could be used to remember the principle of superposition? younger over older
What is an example of an unconformity? a gap of about 1 billion years between two rock layers
What is a trace fossil? a fossil used to date surrounding rock layers
What happens during radioactive decay? radioactive isotopes break down into stable isotopes of other elements
Where are most fossils preserved? in sedimentary rock
What would a large mudslide most likely form into? a fossil formation
What dating technique would you use to compare the ages of fossils found in layers of sedimentary rock? relative dating
What most likely causes ripple patterns on a layer of sedimentary rock? the sediment was laid down at the bottom of a river with a fast current
What is an index fossil? a fossil that is widespread but found only in a short period of geologic time
What is radioactive dating used for? to determine the absolute age of a rock layer
Why is the fossil record incomplete? most organisms never became fossils
What did Scientists study to learn about the Earth's history? rocks and fossils
What is Carbon-14 used for? it is used in radioactive dating of once living material
What method was used to help Scientists determine that Earth is about 4.5 billion years old? radioactive dating
What species was best suited to the climate change in early Earth history when the land became drier and warmer? reptiles
What is absolute dating? finding the age of a rock based on the ratio of parent material to daughter material
What are Trilobites? early arthropods found throughout the oceans of the Earth that went extinct at the end of the Permian period
Where are most fossils of animals and plants found? sedimentary rocks
What are Fusilinids? a dominant form of Foraminifera during the late Permian
What is an Ottonosia? a type of algae that lived up until the Jurasic time period that was found in Kansas and parts of Northern Wyoming
Created by: ndmsteach
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