Spreading is slower in the mid-Atlantic than along the east-Pacific. Continental Drift, Sea-Floor Spreading, and Plate Tectonics Since the construction of the first good maps of the continents, people have puzzled over the close match between the coastlines of South America and Africa.
Near the equator, the magnetic field is nearly horizontal, near the poles it becomes more vertical. In fact, the reason the continents are so much older than the ocean floor is that the continental crust Plate tectonics essay introduction composed of material too light to sink into the mantle.
The precise lower boundary of a plate depends on the temperature of the mantle material. The Earth's surface is broken into many different sections, called plates.
Ocean Floors and Continents Following World War II, a great deal was learned about sea-floor bathymetry as governments supported exploration of the ocean depths. This theory explains not only about how ancient crust is destroyed along destructive plate margins, but it also explains how new ocean floor is created.
That field was composed of the present day field which the scientists could compute and subtract from the measurements and the magnetic signal produced by the oceanic crust. The ocean ridge system shows up as an interconnected ribbon of red and red-range indicating that the ridges are the youngest part of the oceans.
The thermal expansion of the material beneath the ridge maintains the high elevation and produces a gravitational force that helps slide the two plates apart this force is called ridge push. Overtime, scientists realized that fossils were found in places where they should not be.
The plants are the source of food for man and all other animals. Earthquakes trace path of downward-moving plate as it descends into asthenosphere.
Now if the ocean floor is growing in some places, but the overall surface are of the planet is constant, somewhere ocean floor must be destroyed. As the plates are pulled apart, magma is extracted from the mantle to fill in the void.
However, it is clear that the most active deformation of the plates occurs along their boundaries, where they interact with other plates.
These spots are often at the head of a track of volcanic activity that has "burned through" the lithosphere. The cartoon below depicts the collision of oceanic continental lithosphere. Volcanoes In the map below, each triangle represents the location of a recently active on a geologic time scale volcanoes.
The north magnetic pole and the south magnetic pole exchange places the geographic poles do not change, the magnetic field changes. When two continents converge, a collision zone is formed.
It was discovered that earthquakes were abundant along the ridges that let magma flow from them. The size and position of these plates change over time.
Free plate tectonics papers, essays, and research papers. My Account. Your search returned over - Introduction The plate tectonic plays an important role in understanding many of the geological aspects and observations and it allows scientists to prevent disasters such as earthquakes and volcanoes.
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Jun 21, · Plate Tectonics Essay; Plate Tectonics Essay. Earth Science: Exploring the Geology of Planet Earth Introduction The plate tectonic plays an important role in understanding many of the geological aspects and observations and it allows scientists to prevent disasters such as earthquakes and volcanoes.
Plate Tectonics Theories Analysis.
Jun 21, · Plate Tectonics Plate tectonics are a relatively new theory that has revolutionized the way geologists think about the Earth.
According to the theory, the. - Introduction The plate tectonic plays an important role in understanding many of the geological aspects and observations and it allows scientists to prevent disasters such as earthquakes and volcanoes.
The Africa plate is an interested plate because it bounded with many difference major plates.Plate tectonics essay introduction