What did Wegener actually prove?
Then several discoveries gave evidence of continental drift, and of the actual causes. Wegener was born in Berlin and in 1904 he earned his PhD in Astronomy at the University of Berlin….
|Alma mater||University of Berlin|
|Known for||continental drift|
Why was Wegener’s theory not accepted?
The main reason that Wegener’s hypothesis was not accepted was because he suggested no mechanism for moving the continents. He thought the force of Earth’s spin was sufficient to cause continents to move, but geologists knew that rocks are too strong for this to be true.
What was the response to Wegener’s hypothesis?
In 1912, Alfred Wegener proposed a theory that the continents had once been joined, and over time had drifted apart. This was the Continental Drift Theory. The reaction to Alfred Wegener’s theory tells us much about the workings of science. We are taught that modern scientists are driven only by reason and facts.
Was Wegener’s theory proven?
Wegener published his theory in full in 1915, but his contemporaries mostly found it implausible. By 1930 it had been rejected by most geologists, and it sank into obscurity for the next few decades.
What are the 5 evidence of continental drift?
The evidence for continental drift included the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zones.
What was the major weakness of Wegener’s theory of continental drift?
His greatest weakness of Alfred Wegeners’ continental drift theory was he could not explain what kind of force that caused this continents to move far from each other.
What caused Pangea to break up?
About 180 million years ago the supercontinent Pangea began to break up. Scientists believe that Pangea broke apart for the same reason that the plates are moving today. The movement is caused by the convection currents that roll over in the upper zone of the mantle.
Who came up with the theory of seafloor spreading?
Harry H. Hess
What were the problems with the continental drift theory?
Although now accepted, the theory of continental drift was rejected for many years, with evidence in its favor considered insufficient. One problem was that a plausible driving force was missing. A second problem was that Wegener’s estimate of the speed of continental motion, 250 cm/year, was implausibly high.
What was missing from the continental drift theory?
The greatest problem facing Wegener was the lack of direct evidence for the movements of continents (no GPS at the time!) and no mechanism was known to be powerful enough to move entire continents.
What do scientists now think is causing the continents to move?
Plate tectonic theory explains why continents continue to move. The planet’s outer shell consists of plates that move a few centimeters a year. Heat from the Earth’s interior causes this motion to happen via convection currents in the mantle.
What force moves the earth’s plates?
What is the force that moves the continents Quizizz?
Which two continents fit together most noticeably?
Answer. The east coast of South America and the west coast of Africa seem to fit together like pieces of a jigsaw puzzle, and Wegener discovered their rock layers “fit” just as clearly. South America and Africa were not the only continents with similar geology.
Which is one type of evidence that geologists usually study?
Answer. Geologists have used two main types of evidence to learn about Earth’s interior: direct evidence from rock samples and indirect evidence from seismic waves. The geologists are observing rock on Earth’s surface.
What is one piece of evidence of seafloor spreading?
There is lots of evidence that proves that seafloor spreading is occurring. One piece of evidence is mid-ocean ridges. Rocks found near mid-ocean ridges are young and get older as the distance from the ocean ridge increases.
What is the importance of seafloor spreading?
Significance. Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere.
What is seafloor spreading and why is it important?
Today it refers to the processes creating new oceanic lithosphere where plates move apart. Seafloor spreading replaces the lithosphere destroyed by subduction, and exerts important influences on Earth’s chemical and biological evolution.
What are 3 types of evidence for seafloor spreading?
Several types of evidence from the oceans supported Hess’s theory of sea-floor spreading-evidence from molten material, magnetic stripes, and drilling samples.
Where is active seafloor spreading occurring today?
What kind of activity causes seafloor spreading?
What is the importance of seafloor spreading in understanding the origin of the plate movement?
Answer. Answer: Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere.
Is Earth getting larger and wider when plates?
The earth’s size doesn’t change. When one plate drifts away from the other, the other side of the plate gets sucked under by other plates. Therefore, the earth’s size does not change. The Earth is not increasing in size as the Tectonic Plates drift away from each other.
How Wegener’s theory changed after his death and why?
Wegener’s theory found more scattered support after his death, but the majority of geologists continued to believe in static continents and land bridges. By the late 1960s, plate tectonics was well supported and accepted by almost all geologists.