Types of Plate Boundaries Submitted by WWW.ASSIGNMENTPOINT
... apart (Figure 1). Today's active divergent boundaries are midoceanic ridges (sea floor spreading centers). Divergent boundaries can also develop on land, as did those that broke up Pangaea about 200 million years ago. Continental rifting can end before the crustal mass has been fully separated. Thes ...
... apart (Figure 1). Today's active divergent boundaries are midoceanic ridges (sea floor spreading centers). Divergent boundaries can also develop on land, as did those that broke up Pangaea about 200 million years ago. Continental rifting can end before the crustal mass has been fully separated. Thes ...
3.3 Plates Move Apart
... Transform faults occur along divergent oceanic and continental plate boundaries Plates slide past each other building up tension until the tension is released during an earthquake ...
... Transform faults occur along divergent oceanic and continental plate boundaries Plates slide past each other building up tension until the tension is released during an earthquake ...
Divergent margin animation text
... Plate Boundary: Divergent (Fast-spreading Ridge) At divergent margins lithospheric plates move in opposite directions. The plates, which include crust and part of the upper mantle ride over the asthenosphere. As hot mantle rock rises to shallow depths, it begins to melt due to lowered pressure. This ...
... Plate Boundary: Divergent (Fast-spreading Ridge) At divergent margins lithospheric plates move in opposite directions. The plates, which include crust and part of the upper mantle ride over the asthenosphere. As hot mantle rock rises to shallow depths, it begins to melt due to lowered pressure. This ...
A1980JF47100001
... summer of 1963 for more detailed experiments. Maurice felt very strongly that though geophysical experiments were elegant and informative, it was important to find out something about the rocks on which the measurements were being made. This was an unfashionable view at the time, but I had been draf ...
... summer of 1963 for more detailed experiments. Maurice felt very strongly that though geophysical experiments were elegant and informative, it was important to find out something about the rocks on which the measurements were being made. This was an unfashionable view at the time, but I had been draf ...
Exam1B
... d) increased temperature leads to melting of the subducting plate 7. How does magma form at a mid-ocean spreading ridge? a) water circulates down into the mantle and triggers melting by lowering the melting point of the mantle b) the underlying mantle is molten everywhere and simply rises to the sur ...
... d) increased temperature leads to melting of the subducting plate 7. How does magma form at a mid-ocean spreading ridge? a) water circulates down into the mantle and triggers melting by lowering the melting point of the mantle b) the underlying mantle is molten everywhere and simply rises to the sur ...
Plate Motions Activity
... 1. Make a copy of the isochron map (Black and White is OK) and using scissors remove seafloor that is less than 40 Ma (Red and Orange color). 2. Make a reconstruction of the Earth at 40 Ma by putting the remaining map pieces back together at the ridge boundaries assuming that Antarctica is stationar ...
... 1. Make a copy of the isochron map (Black and White is OK) and using scissors remove seafloor that is less than 40 Ma (Red and Orange color). 2. Make a reconstruction of the Earth at 40 Ma by putting the remaining map pieces back together at the ridge boundaries assuming that Antarctica is stationar ...
The modern picture of plate tectonics
... Fossils on the sea floor, the amount of sediment cover, and direct dating techniques all show that the crust nearest to the mid-oceanic ridges is the youngest, and that age increases away from the ridges. ...
... Fossils on the sea floor, the amount of sediment cover, and direct dating techniques all show that the crust nearest to the mid-oceanic ridges is the youngest, and that age increases away from the ridges. ...
Word format
... Where does the fastest plate motion occur on Earth? ___________________________ How fast is the spreading rate at this ridge? ________ cm/year How many tectonic plates are there? _______________ These plates consist of brittle crust and upper mantle, (called the ____________________) floating around ...
... Where does the fastest plate motion occur on Earth? ___________________________ How fast is the spreading rate at this ridge? ________ cm/year How many tectonic plates are there? _______________ These plates consist of brittle crust and upper mantle, (called the ____________________) floating around ...
4. Plate Tectonics II (p. 46-67)
... Where does the fastest plate motion occur on Earth? ___________________________ How fast is the spreading rate at this ridge? ________ cm/year How many tectonic plates are there? _______________ These plates consist of brittle crust and upper mantle, (called the ____________________) floating around ...
... Where does the fastest plate motion occur on Earth? ___________________________ How fast is the spreading rate at this ridge? ________ cm/year How many tectonic plates are there? _______________ These plates consist of brittle crust and upper mantle, (called the ____________________) floating around ...
Plate Tectonics
... fossils were found on different continents that would have been joined during Pangaea. Example = Mesosaurus (S. America and W. Africa) • Climate ...
... fossils were found on different continents that would have been joined during Pangaea. Example = Mesosaurus (S. America and W. Africa) • Climate ...
The Theory of Plate Tectonics
... that the continents were once a single landmass that drifted apart and are still doing so. ...
... that the continents were once a single landmass that drifted apart and are still doing so. ...
Chapters Four and Twenty
... Subduction zones are formed as a result of oceanic crust being more dense that continental crust. ...
... Subduction zones are formed as a result of oceanic crust being more dense that continental crust. ...
Name: Date: Period: ____
... The San Andreas Fault is this type of boundary. – convergent, divergent, or transform What is the name of the “super continent”? – Eurasia, Gondwana or Pangaea Where will you find the oldest rock in the area of the mid-Atlantic ridge? - farthest from the ridge - in the rift valley - at the ridge’s b ...
... The San Andreas Fault is this type of boundary. – convergent, divergent, or transform What is the name of the “super continent”? – Eurasia, Gondwana or Pangaea Where will you find the oldest rock in the area of the mid-Atlantic ridge? - farthest from the ridge - in the rift valley - at the ridge’s b ...
lithosphere, mid-ocean ridge
... What evidence from the sea floor shows that tectonic plates move? a. The sea floor is much older than any of the continents. b. The sea floor is youngest near a mid-ocean ridge and ...
... What evidence from the sea floor shows that tectonic plates move? a. The sea floor is much older than any of the continents. b. The sea floor is youngest near a mid-ocean ridge and ...
Exam
... was replaced by the theory of plate tectonics was incorporated within the theory of plate tectonics A and B are both correct; C is incorrect ...
... was replaced by the theory of plate tectonics was incorporated within the theory of plate tectonics A and B are both correct; C is incorrect ...
Plate Tectonics Powerpoint
... A subduction zone occurs when one oceanic plate is forced down into the mantle beneath a second plate. Oceanic-Continental - Denser oceanic slab sinks into the asthenosphere. - Pockets of magma develop and rise. - Continental volcanic arcs form in part by volcanic activity caused by the subducti ...
... A subduction zone occurs when one oceanic plate is forced down into the mantle beneath a second plate. Oceanic-Continental - Denser oceanic slab sinks into the asthenosphere. - Pockets of magma develop and rise. - Continental volcanic arcs form in part by volcanic activity caused by the subducti ...
Life on an Ocean Planet
... Magma chambers in mantle push through surface of crust Crust moves over mantle forming island chain ...
... Magma chambers in mantle push through surface of crust Crust moves over mantle forming island chain ...
Abyssal plain
An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3000 and 6000 m. Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains cover more than 50% of the Earth’s surface. They are among the flattest, smoothest and least explored regions on Earth. Abyssal plains are key geologic elements of oceanic basins (the other elements being an elevated mid-ocean ridge and flanking abyssal hills). In addition to these elements, active oceanic basins (those that are associated with a moving plate tectonic boundary) also typically include an oceanic trench and a subduction zone.Abyssal plains were not recognized as distinct physiographic features of the sea floor until the late 1940s and, until very recently, none had been studied on a systematic basis. They are poorly preserved in the sedimentary record, because they tend to be consumed by the subduction process. The creation of the abyssal plain is the end result of spreading of the seafloor (plate tectonics) and melting of the lower oceanic crust. Magma rises from above the asthenosphere (a layer of the upper mantle) and as this basaltic material reaches the surface at mid-ocean ridges it forms new oceanic crust. This is constantly pulled sideways by spreading of the seafloor. Abyssal plains result from the blanketing of an originally uneven surface of oceanic crust by fine-grained sediments, mainly clay and silt. Much of this sediment is deposited by turbidity currents that have been channelled from the continental margins along submarine canyons down into deeper water. The remainder of the sediment is composed chiefly of pelagic sediments. Metallic nodules are common in some areas of the plains, with varying concentrations of metals, including manganese, iron, nickel, cobalt, and copper. These nodules may provide a significant resource for future mining ventures.Owing in part to their vast size, abyssal plains are currently believed to be a major reservoir of biodiversity. The abyss also exerts significant influence upon ocean carbon cycling, dissolution of calcium carbonate, and atmospheric CO2 concentrations over timescales of 100–1000 years. The structure and function of abyssal ecosystems are strongly influenced by the rate of flux of food to the seafloor and the composition of the material that settles. Factors such as climate change, fishing practices, and ocean fertilization are expected to have a substantial effect on patterns of primary production in the euphotic zone. This will undoubtedly impact the flux of organic material to the abyss in a similar manner and thus have a profound effect on the structure, function and diversity of abyssal ecosystems.