9 votes

How accurate is the law of superposition?

The principle does not apply to all materials on earth as observed by us but is primarily concerned with sediments and rocks that form from sediments. Since sedimentation is a process driven by ...
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7 votes
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Does iron in core have chance to come out to crust?

No, we occasionally get fragments of upper mantle overthrust onto the Earth's crust, but then the specific gravity (density) contrast is not so great, roughly 2.7 to 3.0 for crust, about 3.2 for ...
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4 votes
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How does Vertical Electrical Sounding Work?

The diagram is perhaps a little mis-leading. Think of the ground/rock between the electrodes as a big resistor. The surrounding rock can be modeled as a set of parallel resistors. Most of the ...
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  • 3,843
4 votes

How accurate is the law of superposition?

Here is another example where the law of superposition breaks. Mind you this is a natural process: meteorite impacts. A meteorite impact will excavate material from the bottom, and deposit it above ...
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4 votes

How accurate is the law of superposition?

As Peter correctly responds, for sedimentary rocks the principle of superposition is pretty much watertight except where tectonic superposition takes place. The latter can either repeat the ...
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4 votes

Do Earth's layers move at different speeds?

The inner core rotates slightly faster than the rest of the planet. This passage from National Geographic explains: The liquid outer core separates the inner core from the rest of the Earth, and ...
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  • 2,137
4 votes
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Do Earth's layers move at different speeds?

Im am currently doing my masters in geophysics (last semester) and before that I did a bachelor in geoscience. I assume by layers you mean the crust, the mantle and the core. These all have ...
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3 votes

How is geological time divided into units?

The divisions in the geologic time scale have evolved over time. Its origins can be traced back to Nicolaus Steno in 1669 described two basic geologic principles. The first stated that sedimentary ...
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3 votes
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What produces these amazing 3D structures in Tibet?

The terrain examples show some striking similarities to what is referred to in the United States as "Badlands" - a type of terrain formed by layered sedimentary strata of rock that is soft enough to ...
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  • 1,104
2 votes

Is There a Correlation Between Earthquake Magnitude and the Deformation Observed in the Rock?

Generalizing such relationships is, as suggested above, hard to impossible - but for well studied and understood systems such correlations have been observed. For instance there is a clear, and almost ...
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  • 1,606
2 votes

Oldest to Newest Bedrock in the USA "road trip"

If you were hoping for a smooth succession from Archean all the way down to Quaternary, you're going to be disappointed. Geology is messier than rocks being serenely laid down continuously through ...
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  • 3,133

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