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WEGENER'S HYPOTHESIS OF CONTINENTAL DRIFT
Transcript of WEGENER'S HYPOTHESIS OF CONTINENTAL DRIFT
Summarize Wegener’s hypothesis of continental drift.
Describe the process of sea-floor spreading.
Identify how paleomagnetism provides support for the idea of sea-floor spreading.
Explain how sea-floor spreading provides a mechanism for continental drift.
Continental drift the hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present location.
WEGENER PROPOSED 3 PROOF'S IN 1912 #1 Fossil Evidence: fossils of the same plants and animals could be found in areas of continents that had once been connected. #2 Evidence from Rock Formations: ages and types of rocks in the coastal regions of widely separated areas matched closely.
#3 Climatic Evidence: changes in climatic patterns suggested the continents had not always been located where they are now.
He called this super-continent PANGAEA, a Greet word that means "all the earth.“
MID OCEAN RIDGE is a long, undersea mountain chain that has a steep, narrow valley at its center, that forms as magma rises from the asthenosphere, and that creates new oceanic lithosphere (sea floor) as tectonic plates move apart
**Rocks closer to a mid-ocean ridge are younger than rocks farther from the ridge. Rocks closer to the ridge are covered with less sediment than rocks farther from the ridge. Sea-floor spreading is the process by which new oceanic lithosphere (sea floor) forms as magma rises to Earth’s surface and solidifies at a mid-ocean ridge
As the ocean floor spreads apart, magma rises to fill the rift and then cools to form new rock.
Paleomagnetism is the study of the alignment of magnetic minerals in rock, specifically as it relates to the reversal of Earth’s magnetic poles; also the magnetic properties that rock acquires during formation
As magma solidifies to form rock, iron-rich minerals in the magma align with Earth’s magnetic field. When the rock hardens, the magnetic orientation of the minerals becomes permanent.
Scientists discovered a striped magnetic pattern on the ocean floor on each side of a mid-ocean ridge.
The pattern on one side of the ridge is a mirror image of the pattern on the other side.
The pattern of magnetic symmetry and age of rock formation indicate that new rock forms at the center of a ridge and then move away from the center in opposite directions