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Impacts and Mass Extinctions
Terms in this set (15)
What is the biosphere?
Zone that contains all living and past living organisms on earth
Ecosystems make up the _________________.
Which level of a food chain/web is most detrimental to success?
The primary producers/first level. Without them, the whole ecosystem will crash.
Stratigraphy and Biostratigraphy use ______ ___________ to understand the passage of time on earth as well as evolution.
Stratigraphy is the study of_________________?
Biostratigraphy is apart of stratigraphy, and identifies the relative ages of rock layers using ____________?
Principal of superposition
In layered strata, the top layer is the youngest (exceptions for layer movement due to earthquakes etc.) (Nicholas Steno)
Principal of original horizontality
Rock layers that are tilted or folded, they were originally flat. (Nicholas Steno)
Principal of lateral continuity
Rock strata is continuous over great distance
Principal of cross-cutting relationships
"If it cuts through, it is probably younger"
Uniformitarianism (James Hutton)
The same natural laws and processes that operate now, have always operated in the past
Is a fault line the youngest or oldest rock layer among the layer is cuts through?
Fossils succeed each other vertically, meaning...
younger fossils are closer to the surface of the earth and help us date rock over wide horizontal distances.
Strata of like _______ can be dated and correlated by the _________ they contain.
What is the range of a fossil?
The amount of time a species exists (from evolution to extinction/beginning to end)
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