History Of Plate Tectonics.
Category: Otro
Actualizado: 13 ene 2020
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Created byAidan Schenek
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Abraham Ortelius and Alexander
Von Humboldt first observed the puzzle fit of the coastlines of continents.
Ortelius saw how the shapes of
Africa and South America appeared
to fit together, his and Von
Humboldt's were the first piece of
evidence that pieces of Earth's
lithosphere moves.
I used Article 1.Alfred Wegener formed a
hypothesis of continental drift.
Wegener started to form a
hypothesis based on some evidence
that could support his theory.
One piece of evidence he used
to explain his theory was that
many continents looked as tho
they could fit together. Another
piece of evidence he used was
that animal and plant fossils have
been found on different continents,
and the couldnt have swam across
the oceans.
I used article 2.Arthur Holmes discovered mantle
convection currents. Holmes
proposed the theory of convection
currents in Earth. He observed when
things heated they become less
dense and rose, as they go up the
cool and become more dense
and sink. he believed this
pressure could crack and move
the continents.
I used article 3.Harry Hess proposed the theory
of seafloor spreading. The
Mid-Atlantic Ridge was found in
the 1960's. It is 40,000 miles long.
Some evidence that supports
Hess's theory is that rock closer
to the ridge is younger, and as you
get further away from the ridge is
older. Another piece of evidence
is that the seafloor is younger
than the continents, that means
older crust gets reabsorbed into
the mantle.
I used article 5.Frederick Vine and Drummond
Matthews discovered magnetic
striping on the ocean floor.
Studies started to show that the
magnetic poles switch over time.
On the ocean floor there are
magnetic stripes, and they
show when there was a normal
or reversed magnetic pole.
I used article 5.
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