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What is a law that states that in undisturbed sedimentary rocks each layer is older than the layer above it and younger than the layer below it.?

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what is a law that states that in undisturbed sedimentary rocks each layer is older than the layer above it and younger than the
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The law of superposition. It states that if a series of layered sediments have not been overturned, the oldest layers are on the bottom and the youngest are on the top.
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There are three kinds of rocks, namely: Igneous, Sedimentary, and Metamorphic Rocks. Igneous rocks are the type of rocks that come from volcanoes, and these come in huge boulders
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According to the Wikipedia article http://en.wikipedia.org/wiki/Ozone_depletion#The_ozone_hole_and_its_causes : "...ozone depletion can take place in the gas phase, but it is
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Sedimentary rocks form where there has been water at one time. Minerals carried by wind, water, ice, or gravity are dropped off in bodies of water where they sink ...
Sedimentary rocks are types of rock that are formed by the deposition of material at the earth's surface and within bodies of water. Sediments are carried by wind ...
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