Interactives . Dynamic Earth . Slip, Slide, & Collide
Read and learn for free about the following article: Plates on the Move. When the edges of plates meet, four things can happen: © AMNH. Even though plates. At some convergent boundaries, an oceanic plate collides with a continental plate. Oceanic . What happens when two continental plates collide? Because the. The Earth's thin outer shell is broken into big pieces called tectonic plates. These plates fit When the edges of plates meet, four things can happen: Diagram of.
What Happens Where Tectonic Plates Meet? — Mr. Mulroy's Earth Science
As the oceanic crust sinks, a deep oceanic trench, or valley, is formed at the edge of the continent. The crust continues to be forced deeper into the earth, where high heat and pressure cause trapped water and other gasses to be released from it. This, in turn, makes the base of the crust melt, forming magma. The magma formed at a subduction zone rises up toward the earth's surface and builds up in magma chambers, where it feeds and creates volcanoes on the overriding plate.
Plates on the Move (article) | Khan Academy
When this magma finds its way to the surface through a vent in the crust, the volcano erupts, expelling lava and ash. An example of this is the band of active volcanoes that encircle the Pacific Ocean, often referred to as the Ring of Fire. Illustration depicting how island arcs are formed. A subduction zone is also generated when two oceanic plates collide — the older plate is forced under the younger one — and it leads to the formation of chains of volcanic islands known as island arcs.
The Andes is an example of this type of collision. Where continental crust meets continental crust Both continental crusts are too light to subduct so a continent-continent collision occurs, creating especially large mountain ranges. The most spectacular example of this is the Himalayas.
Divergent boundaries — where two plates are moving apart. The space created can also fill with new crustal material sourced from molten magma that forms below. Divergent boundaries can form within continents but will eventually open up and become ocean basins.
On land Divergent boundaries within continents initially produce rifts, which produce rift valleys. Under the sea The most active divergent plate boundaries are between oceanic plates and are often called mid-oceanic ridges.
A normal fault is defined by the hanging wall moving down relative to the footwall, which is moving up.
Figure 2 - A normal fault. The 'footwall' is on the 'upthrown' side of the fault, moving upwards.
The 'hanging wall' is on the 'downthrown' side of the fault, moving downwards. Reverse faults are cracks formed where one plate is pushing into another plate.
What Happens Where Tectonic Plates Meet?
They also occur where a plate is folding up because it's being compressed by another plate pushing against it. At these faults, one block of rock is sliding underneath another block or one block is being pushed up over the other.
A reverse fault is defined by the hanging wall moving up relative to the footwall, which is moving down. Figure 3 - A reverse fault. This time, the 'footwall' is on the 'downthrown' side of the fault, moving downwards, and the 'hanging wall' is on the 'upthrown' side of the fault, moving upwards. When the hanging wall is on the upthrown side, it 'hangs' over the footwall.