Which hypothesis was confirmed by paleomagnetic evidence
The study of the Earth’s magnet field, as it was recorded in rock records, was a key to reconstructing the history and movements of plates. As we have seen, magnetic reversals were instrumental in confirming the seafloor spreading hypothesis.
What is paleomagnetic evidence?
Paleomagnetism is the study of the ancient magnetic field of both rocks and the Earth as a whole. Paleomagnetism provides strong quantitative evidence of polar wandering and continental drift. This magnetism results from the alignment of magnetic fields within rocks.
How did paleomagnetism confirm plate tectonics?
Paleomagnetism also provides evidence to support theories in plate tectonics. The ocean floor is mainly composed of basalt (an iron-rich material containing minerals that align to the magnetic field), and they record the alignments of the magnetic fields around oceanic ridges.
What evidence from paleomagnetic studies provided support for continental drift?
Paleomagnetists led the revival of the continental drift hypothesis and its transformation into plate tectonics. The first geophysical evidence of continental drift was provided by apparent polar wander patterns, and marine magnetic anomalies for seafloor spreading.
Which information is needed to construct a geomagnetic time scale Select the two correct answers?
Each period of reversal in a rock is assigned an absolute geologic date. The geomagnetic timescale of the earth is built by the magnetic direction of rocks and their age along its surface.
What are bathymetric features?
Bathymetry refers to the study of the “beds” or “floors of water bodies such as the ocean, rivers and streams, as well as lakes. Although “bathymetry” was originally used to describe the ocean’s depth relative the sea level, it now refers to “submarine topography”, or the depths of the underwater terrain.
Who proved that seafloor is spreading?
Harry H. Hess
What was Harry Hess’s theory of seafloor spreading?
Hess believed that the oceans would grow from their centers, with molten material or basalt rising from the Earth’s crust along the mid-ocean ridges. This created new seafloor, which spread out from the ridge in both direction.
What is the importance of seafloor spreading in understanding the origin of the plate movement?
Significance. The theory of plate-tectonics relies on continental drift to explain seafloor spreading. Tensional stress can cause fractures in the lithosphere when oceanic plates collide.
Who first discovered seafloor spreading and what was the new technology used?
Alfred Wegener produced evidence in 1912 that the continents are in motion, but because he could not explain what forces could move them, geologists rejected his ideas. Almost 50 years later Harry Hess confirmed Wegener’s ideas by using the evidence of seafloor spreading to explain what moved continents.
What is the fastest moving tectonic plate?
The Pacific, Nazca and Cocos plates move faster than the slower-moving North American, South American and Antarctic plates.