Suppose you have an older brother who takes a lot of photographs of your family and piles them in a box. Over the years, he keeps adding new photographs to the top of the stack.

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Suppose you have an older brother who takes a lot
of photographs of your family and piles them in a
box. Over the years, he keeps adding new
photographs to the top of the stack. Think of
the family history recorded in those
photographs... Where are the oldest
photographs? Where are the most recent
photographs?
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Layers of sedimentary rock are stacked like those
photographs. Which layer is the oldest? Which
layer is the youngest?
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The principle that states that younger rocks lies
above older rocks in an undisturbed sequence is
called SUPERPOSITION
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Superposition can help us understand how old
certain rocks are compared to other rocks. It
can also help us understand the order of
extinction of certain species.
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EXTINCTION is the death of every member of a
species. Extinction can have many different
causes...
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EXTINCTION is the death of every member of a
species. Extinction can have many different
causes...
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Gradual extinction can be caused by Global
climate change Changes in ocean currents Major
environmental changes
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Other causes of extinction...
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Taking animals for profit
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Hunting and trapping
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Overharvesting
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Introduced Species
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Destruction of Habitat
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Pollution
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http//www.uwec.edu/jolhm/EH4/Extinction/CausesLin
k.html