Examples of Constructive Plate Margins: Mid-Atlantic Ridge. The skin is fine-grained and glass-like in appearance, while the interior has a much courser grain. Divergent boundaries are typified in the oceanic lithosphere by the rifts of the oceanic ridge system, including the Mid-Atlantic Ridge and the , and in the continental lithosphere by rift valleys such as the famous East African. Copy out the sentences you think are correct. Where they move apart in continental crust they produce rift valleys. Occasionally, conservative plate boundaries occur in continental plates.
An example of this happening is the island several kilometres southwest of the Westman Islands which happened in April 1964. Water is formed in the empty space between the two plates. As it descends friction, increasing pressure and heat from the mantle melt the plate. There are several really good examples of Destructive plate margins, including along the West coast of the Americas and Japan, where the Philippines sea plate is pushed under the Eurasian plate. The friction causes melting of the oceanic plate and may trigger earthquakes.
The area is also associated with volcanic activity for example the highest mountain in Africa, Mt Kilimanjaro. As these plates move apart this leaves cracks and fissures, lines of weakness, that allows magma from the mantle to escapes from the highly pressurised interior of the planet. All along the mid ocean ridge, volcanic activity is pouring new lava out onto the seabed. Examples below include the South American Plate and African Plate and the Eurasian Plate and the North American Plate. As they do this, wells up to fill the gap and when it reaches the surface new crust is formed, often in the form of a. Measuring 30 to 75 km thick the continental crust is thicker than the oceanic crust, which is only 3 to 10 km thick.
Even though, humans have existed on Earth for around 200,000 years, humans have been responding to the challenges of living on a planet with a constantly changing surface by using scientific evidence and technology to help them adapt to a constantly changing environment. Some plate margins exhibit features of more than one of the three main types and are known as. Here , the Indo Australian plate is colliding with the Eurasian plate and has done so for millions of years. These tend to be shallow-focus earthquakes, originating near the surface. As these plates move apart this leaves cracks and fissures, lines of weakness that allows magma from the mantle to escapes from the highly pressurised interior of the planet.
It is a continual range of highlands along the western coast of South America. At these margins we get fold mountains and earthquake activity, and a fantastic example of this is the Himalayan mountains. Molten rock and magma immediately rises to fill any possible gap and froms new oceanic crust. These margins are mainly found around the edges of oceans and the majority are found around the Pacific Ocean in what is known as the Ring of Fire. Though natural elements are three-dimensional from the naked human eye and simple to handle, computers and other such instruments take the dimension to the next level. All of these plates are in continuous motion moving in different directions. On the ocean floor the plates are spreading.
As it sinks below the continental plate the oceanic plate melts due to friction in the subduction zone. Cross section of a conservative tensional plate margin source: Constructive tensional plate margins occur where plates move apart. By not entertaining the argument, a positive person can diffuse the situation quickly. The constructive margin has split the continent of Laurasia into 2, and evidence of this can be seen in the geology of the C aledonide mountains in North America and Europe. When one worries only about how other people are affecting them, he or she cannot focus on how to fix the situation.
It is the result of subduction, and the distance of 160km from the coastlines of Peru and Chile give you an indication of just how far in distance the oceanic plate subducts under the continental lithosphere before mountain building orogeny can occur. Here, the Indo Australian plate is colliding with the Eurasian plate and has done so for millions of years. This movement caused the , which had a deeper than normal hypocentre or focus of 15-18km. Eventually after the two continental plates keep pushing into each other one will give way and be forced under the other one. Such ridges are only a few miles high, but hundreds of miles in width. It is 22 mi 35 km thick on average and less dense than oceanic crust, which accounts for its mean surface elevation of about 3 mi 4.
This is a process known as sea floor spreading developed by Hess. Each layer is thicker than the layer above. The Andes range is the world's highest mountain range outside of the continent of Asia. Another example is the Alpine fault in New Zealand, which caused the. The interior cooling takes thousands of years.
Sometimes the plates get stuck and pressure builds and builds until eventually they suddenly jerk forwards. The continental plate is crumpled by the pressure and forms. Convection currents moving in opposite directions caused by the intense heat of the Earth's interior in the mantle move two plates apart. This is often s ome distance from the margin where magma can eventually re-emerge at the surface to create a range of mountains. An oceanic plate denser is pushed towards a continental plate less dense by convection currents deep within the Earth's interior. It is a rap video that may help you memorise parts of the plate tectonics in general, not only constructive plate margins.