Which of the Following Provides Evidence for Plate Tectonics.
Despite its seeming solidity, the Earth is dynamic. Its shifting tectonic plates can cause earthquakes, eruptions and fifty-fifty change the shape of continents. Larn something of how information technology works below.
Structure of the Earth
A formulation of the Globe’due south structure is necessary to an agreement of plate tectonics. For general purposes, the Earth tin can exist divided into four basic layers: the inner core, the outer core, the mantle and the chaff. Despite immense temperatures, the Earth’s core, equanimous largely of iron, is solid. The terrific amount of gravitational pressure keeps the ore from liquefying. The outer core, similar in limerick to the inner, is under less pressure and therefore liquid. Adjacent comes the mantle, which is largely solid but still capable of move. Finally, there is the chaff, the exceedingly thin skin of the planet on which humans and all other known life live. The chaff is broken into plates that conduct the continents and oceans.
The most widely accepted theory holds that plate move originates from convection currents in the mantle. The estrus from the cadre transfers to the mantle, where the hotter less dense material rises while the cooler sinks. This movement forms convection currents. These currents transfer motility to the crust, either spreading plates apart or pushing them together. Faults or discontinuities in a rock mass are common in these areas. A survey of fault types is besides involved to include hither.
Divergent boundaries occur where two upwelling currents run into, turning opposite from i another. Hither the plates are moved apart and matter from the drapery escapes to the crust. This is oftentimes called seafloor spreading where magma oozes out onto the sea floor creating a ridge of “new” crust. These boundaries can also create rift valleys, normal faults and shallow earthquake activities. The Mid-Atlantic Ridge is the most famous divergent boundary.
Convergent boundaries are formed where ii downturning currents see. They, likewise, motility in reverse directions, but the internet outcome pulls the plates together and drags material back into the mantle. The outcome of these slow-motion collisions differs according to location. The oceanic crust is somewhat denser than the continental, so information technology plunges underneath creating a subduction zone and creating strong earthquakes and uplifted mountain ranges. Subduction occurs when two oceanic plates see likewise. In this example, it is often the older and denser plate that subducts. This creates features such as the Marianas Trench in the Pacific Body of water. Here the ocean depth is greater than the top of Mountain Everest. Volcanoes and earthquakes are common along these types of subduction zones, as typified by the famous “Band of Fire” in the Pacific Ocean.
A slightly different kind of convergent purlieus is created when two continents collide. There is merely minimal subduction in these cases. Instead, the chaff plies up, creating mount ranges such as the Himalayas. Earthquakes, faults and folding occur in these zones.
Transform boundaries are not directly related to mantle upwelling or subduction but are instead created past two or more than plates rubbing alongside each other. These create faults ordinarily associated with earthquakes. I of the best known of these is the San Andreas Fault.
This brief survey only hints at the complexities involved in studying the living planet. For those interested, farther study of geology is recommended.
Which of the Following Provides Evidence for Plate Tectonics