Divergent boundaries — where new crust is generated as the plates pull away from each other.
Convergent boundaries — where crust is destroyed as one plate dives under another.
Then, what are the different types of tectonic plates?
There are three main types of plate boundaries:
Convergent boundaries: where two plates are colliding. Subduction zones occur when one or both of the tectonic plates are composed of oceanic crust.
Divergent boundaries – where two plates are moving apart.
Transform boundaries – where plates slide passed each other.
What are the two types of tectonic plates?
Tectonic lithosphere plates consist of lithospheric mantle overlain by one or two types of crustal material: oceanic crust (in older texts called sima from silicon and magnesium) and continental crust (sial from silicon and aluminium).
What are the four types of tectonic plate boundaries?
There are three kinds of plate tectonic boundaries: divergent, convergent, and transform plate boundaries. This image shows the three main types of plate boundaries: divergent, convergent, and transform. Image courtesy of the U.S. Geological Survey.
What are the four types of plate movements that can cause earthquakes?
There are three main types of plate boundary: divergent, convergent and transform. Plates move away from one another at divergent boundaries. This happens at mid-ocean ridges. Plates move towards one another at convergent boundaries; one plate is forced below another in a process called subduction.
Which plate boundary has the strongest earthquakes?
At convergent plate boundaries, where two continental plates collide earthquakes are deep and also very powerful. In general, the deepest and the most powerful earthquakes occur at plate collision (or subduction) zones at convergent plate boundaries.
What are the three different types of convergent plate boundaries?
There are three types of convergent boundaries each with its own consequences.
Oceanic-Continental Convergence. The first type of convergent boundary is Oceanic-Continetal Convergence.
Oceanic-Oceanic Convergence. The next type is Oceanic-Oceanic Convergence.
What are the tectonic plates?
A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest.
What is the name of where two tectonic plates meet?
THE SPACE WHERE TWO TECTONIC PLATES MEET IS CALLED A PLATE BOUNDARY.
How do the tectonic plates move?
Plates at our planet’s surface move because of the intense heat in the Earth’s core that causes molten rock in the mantle layer to move. It moves in a pattern called a convection cell that forms when warm material rises, cools, and eventually sink down. Tectonic Plate is a piece of crust and uppermost mantle of Earth.
What type of plate boundary is the San Andreas Fault?
The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal).
How fast are the earth’s tectonic plates moving?
About 2 to 5 centimeters per year (1 to 2 inches per year), about the same speed that your fingernails grow. We know, then, that the outermost part of Earth consists of a series of large slabs (tectonic plates; lithospheric plates) that move slowly over the globe, powered by flow in the interior mantle.
What is the theory of plate tectonics?
Plate tectonics is the theory that the outer rigid layer of the earth (the lithosphere) is divided into a couple of dozen “plates” that move around across the earth’s surface relative to each other, like slabs of ice on a lake.
What is a destructive plate boundary?
A destructive plate boundary is sometimes called a convergent or tensional plate margin. This occurs when oceanic and continental plates move together. The oceanic plate is forced under the lighter continental plate. Friction causes melting of the oceanic plate and may trigger earthquakes.
What are the three subtypes of convergent plate boundaries?
The three types of convergent plate boundaries include oceanic-continental convergence, oceanic-oceanic convergence, and continental-continental convergence.
Do divergent plate boundaries cause volcanoes?
Most active divergent plate boundaries occur between oceanic plates and exist as mid-oceanic ridges. Divergent boundaries also form volcanic islands which occur when the plates move apart to produce gaps which molten lava rises to fill.
Why do Earth’s tectonic plates move?
This process is called continental drift. The plates move because of convection currents in the Earth’s mantle. These are driven by the heat produced by the decay of radioactive elements and heat left over from the formation of the Earth.
What is subduction and where does it occur?
Subduction is a geological process that takes place at convergent boundaries of tectonic plates where one plate moves under another and is forced or sinks due to gravity into the mantle. Regions where this process occurs are known as subduction zones.
What do divergent plate boundaries cause?
Divergent boundaries in the middle of the ocean contribute to seafloor spreading. As plates made of oceanic crust pull apart, a crack in the ocean floor appears. Magma then oozes up from the mantle to fill in the space between the plates, forming a raised ridge called a mid-ocean ridge.
Do transform plate boundaries cause earthquakes?
Places where plates slide past each other are called transform boundaries. Although transform boundaries are not marked by spectacular surface features, their sliding motion causes lots of earthquakes. The strongest and most famous earthquake along the San Andreas fault hit San Francisco in 1906.
How do the tectonic plates cause earthquakes?
Causes. An earthquake is the shaking and vibration of the Earth’s crust due to movement of the Earth’s plates (plate tectonics). Earthquakes can happen along any type of plate boundary. Earthquakes occur when tension is released from inside the crust.
Where are most of the plate boundaries?
Egger. Also similar to earthquakes, different kinds of volcanoes occur along different types of plate boundaries. Most of the volcanic eruptions that make the news, such as the 1980 Mount St. Helens eruption, take place near subduction zones.
What structures can form at divergent plate boundaries?
Effects that are found at a divergent boundary between oceanic plates include: a submarine mountain range such as the Mid-Atlantic Ridge; volcanic activity in the form of fissure eruptions; shallow earthquake activity; creation of new seafloor and a widening ocean basin.