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The Earth is made up of a thin crust of cool hardened rock that floats on a huge ball of of molten to semi-molten rock. This crust is broken up into multiple large parts called tectonic plates. The molten rock underneath undergoes "convection", like a slow boil, that causes the plates to shift on the surface. This happens extremely slowly at a rate of about a few centimeters per year.
When these plates move away from each other, they create gaps or trenches. There are many notable examples of these trenches, for example, the Mariana Trench as well as the trenches that were so useful to the allied forces during the various world wars where they would take cover from enemy artillery.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agotrenches form at a subduction zone. When a oceanic crust and a continental crust collied the less dense oceanic crust sinks under and creates a trench.
Wiki User
∙ 12y agoa trench is formed when 2 oceanic plates collide
Wiki User
∙ 13y agowhen one plate is more dense than the other, and subducts beneath the lighter one.
Wiki User
∙ 12y agoI think an earthquake is formed when the tectonic plates collide.
Wiki User
∙ 11y agoThere is a type of plate boundary called subduction, where one plate slides underneath another to form a dip in the sea floor. I reccomend looking at an image, it will help.
Wiki User
∙ 11y agoSure. Yea... Deep Sea Trenches can be formed when two lithospheric plates collide. Especially when it involves an oceanic plate and a continental plate.
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Where are the most plate bounderies?
Fault lines.
Why most mountains form near plate boundaries?
Transform, Divergent, and Convergent
Are the plate boundaries the same as the edges of continents?
No. Not all plate boundaries are at the edges of continents, nor do all edges of continents correspond with plate boundaries. Many plate boundaries are found in the middle of oceans, while the continent of Africa is being torn apart by a developing plate boundary. Some edges of continents, such as the west coast of South America are near plate boundaries. These are called active continental margins. Others, such as the east coast of North America, are nowhere near plate boundaries. These are called passive continental margins.
Are the edges of continents are the same as the boundaries of plates?
No. Not all plate boundaries are at the edges of continents, nor do all edges of continents correspond with plate boundaries. Many plate boundaries are found in the middle of oceans, while the continent of Africa is being torn apart by a developing plate boundary. Some edges of continents, such as the west coast of South America are near plate boundaries. These are called active continental margins. Others, such as the east coast of North America, are nowhere near plate boundaries. These are called passive continental margins.
Collision boundaries and subduction boundaries are types of what boundaries?
The older denser plate sinks under a deep ocean trench into the mantle. Some rock above the subducting plate melts and forms magma. Since the magma is less dense than the surrounding rock, it rises toward the surface. Eventually, the magma breaks through the ocean floor, making a volcanoe.
What boundary do subduction zones form on?
Subduction zones form along some tectonic plate boundaries. Of the three general types of tectonic plate boundaries, we will see them form at some (but not all) of what are called convergent plate boundaries.
Where are the most plate bounderies?
Fault lines.
Does island have a lot of volcanoes because it is on the boundary of two plates?
Many volcanic islands are a product of plate boundaries, but some, such as the Hawaiian islands, form over hot spots away from plate boundaries.
Why are most volcanoes located near a fault?
Most volcanoes form at either convergent or divergent plate boundaries. Volcanoes at convergent plate boundaries form when one plate slides under another, taking seawater with it. This causes the rock in the mantle to melt as the melting point drops. This new magma can rise to form volcanoes.At divergent plate boundaries the crust is thing, which lowers pressure on the mantle, causing some material to melt.
Why most mountains form near plate boundaries?
Transform, Divergent, and Convergent
Where do volcanes erupt?
Along some plate boundaries.
Are hot spots near plate boundaries?
No, Hot Spots can be in the center of plates. An example of a Hot Spot is the Hawaiian Islands.
Are the plate boundaries the same as the edges of continents?
No. Not all plate boundaries are at the edges of continents, nor do all edges of continents correspond with plate boundaries. Many plate boundaries are found in the middle of oceans, while the continent of Africa is being torn apart by a developing plate boundary. Some edges of continents, such as the west coast of South America are near plate boundaries. These are called active continental margins. Others, such as the east coast of North America, are nowhere near plate boundaries. These are called passive continental margins.
Why do some earthquakes occur inside plate boundaries in the interior of a lithospheric plate?
some earthquakes happen inside the plate because they are dumb
Where do volcanic eruptions occur?
Along some plate boundaries.
How are volcanoes formed by convergent plate boundaries?
Where one convergent plate is subducted under another, the sinking slab (which is full of wet sediments and organic remains) is heated and some of it melts to form magmas which migrate upwards to form volcanoes on the edge of the overlying plate.
What plate boundary is a composite volcano on?
Composite volcanoes most often are found near subduction zones. They can be found at either oceanic-oceanic convergent plate boundaries, oceanic-continental plate boundaries, or continental-continental plate boundaries. They are especially prevalent in the Pacific Ring of Fire. A few composite volcanoes, however, have been found at divergent boundaries and away from plate boundaries at hot spots.
