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The 5 Stratigraphic Geological
Principles
* Correlation: if a fossil of the same kind is found
in two different places, the strata belong to the same period
* Dualism: The phenomena at the present time explain the past
* Superposition: the superior strata are later than the inferior ones
* Of Faunistic Succession: the strata can be distinguished because of
its associated fossils
* Of Original Horizontality: the sedimentary strata are, originally,
horizontals
Geology : Geo
+ logos = Study of the Earth
Science that studies the succession of the features and geographical
characteristics that the earth surface, from the moment when the
litosphere first consolidated to our days.
Subdivisions: Cosmology, Paleonthology, Structural Geology, Petrology,
Geomorphology, Physiography, etc. |
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August
26-2005: Inner Core Diferential Motion Confirmed by Earthquake
Waveform Doublets
Jian Zhang, Xiaodong Song, Yingchun Li, Paul G. Richards, Xinlei
Sun, Felix Waldhauser
ABSTRACT - Science Magazine
We analyzed 18 high-quality waveform doublets with time separations
of up to 35 years in the South Sandwich Islands region, for which
the seismic signals have traversed the inner core as PKP(DF).
The doublets show a consistent temporal change of travel times
at up to 58 stations in and near Alaska, and they show a dissimilarity
of PKP(DF) coda. Using waveform doublets avoids artifacts of earthquake
mislocations and contamination from small-scale heterogeneities.
Our results confirm that Earth's inner core is rotating faster
than the mantle and crust at about 0.3° to 0.5° per year.
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(Spanish)
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GEOMORPHOLOGY
Geomorphology studies the relationship
among the different types of soil and certain features of the landscape
(Figure)
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us!
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Outstanding
Mineral
Copper
Symbol: Cu, Atomic Number: 29, Atomic mass: 63.54
With humidity
it gets covered with a layer of basic carbon dioxide which gives
its characteristic green color
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