Joseph Kerski
speaker
638 appearances
3 recordings
1 series
first heard Jun 2026
last heard 1 Aug
Joseph Kerski’s voice in public audio — every appearance, attributed to the second.
Trend
recordings per month · last 12 monthsRecordings per month over the last 12 months — 3 in all, peaking in Aug 2026 with 1.
Appearances
believing that fossils found on different continents were due to land bridges that had long since sunk below the ocean.
About 30 years after Wegener's death, deep-sea studies began to support the idea of continental drift.
New rock was observed and dated in the middle of the oceans.
This new rock emerged from deep within the Earth, pushing continents such as Europe and North America apart.
Rocks equidistant to where the new rock was being formed showed alternating patterns of magnetism.
alternating patterns of magnetism.
At a certain distance on each side of the line where the rocks were forming, the magnetism of all the rocks was aligned with a magnetic pole in one location, and then at another distance, again on each side, the magnetism of all the rocks was aligned with a magnetic pole in the other direction.
This showed how the crust moved away in both directions from the line of rock formation.
All this led to the concept of plate tectonics.
from the Latin tectonicus, meaning building.
This theory explains many of Earth's land and oceanic features as a result of seafloor spreading, and Matthews and others published the evidence for this spreading.
In the 1990s, satellite and GPS evidence showed that the continents can move up to 6 inches, or 15 centimeters, per year, though the more typical rate of movement is 1 to 2 centimeters annually.
Variation exists at the Mid-Atlantic Ridge,
The rate is the same as that at which fingernails grow, 0.39 to 1.57 inches, or 10 to 40 millimeters per year, but is 6.3 inches, or 160 millimeters per year, at the Nazca Plate in the Pacific.
Today it is regularly reported how much continental sections move after major earthquakes, such as during the 2011 Japan earthquake, the ocean bed moved as much as 164 feet, or 50 meters, laterally,
and 52.5 feet, or 16 meters, vertically.
Hmm, that's some movement.
That's amazing.
In plate tectonics, the lithosphere is broken up into seven or eight major plates, depending on how they are defined, and more minor plates.
Ocean plate thickness ranges from 3.72 miles, or 6 kilometers, at the mid-ocean ridges, to 6.2 miles, or 10 kilometers, at continental edges.
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