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Plate Tectonics
Plate tectonics are plate movements which will in turn cause earthquakes, volcanic eruptions, mountain ranges, and islands.
31,188 Questions
What is the process that powers plate tectonics?
- 1 answer
Convection, as heat from the mantle is transferred to the lower crust, which can move very slowly in response to the increased upward pressure. The heat makes the rock liquid (magma) in some areas, allowing it to flow upward to the surface, thus creating spongebob squarepants!
What causes the Earth's tectonic or lithospheric plates to move?
- 2 answers
It iz what it iz
What are three reasons that may cause tectonic plates to move?
- 1 answer
1. Mantle Convection. 2. Ridge Push. 3. Slab Pull. And also; Mantle Plumes and Hot Spot.
How far apart are tectonic plates moving?
- 1 answer
The tectonic plates move at about the same speed your finger nails grow. The gap the plates create when they move apart is constantly being closed up by magma moving up from the mantle.
What does the asthenosphere have the ability to do?
- 2 answers
it has the ability help our people
What are answers 1-17 on the plate tectonics crossword puzzle?
- 1 answer
3.Asthenosphere
4.Subduction
5.Mantle
6.Crust
7.N\A
8.Lithosphere
9.radioactivity
10.Midoceanicridges
11.spreading
12.Trenches
What is the type of plates Surtsey has?
- 1 answer
Surtsey is formed on the convergent boundary between the North American and Eurasian plates. At this location this is oceanic crust.
How many lithospheric plates are there?
- 1 answer
12 major plates.
How will the angle at which an oceanic plate subducts affect the distance from the volcanic arc to the trench?
- 1 answer
The steeper the subduction angle, the closer the arc will be to the trench. This is controlled by the age of the oceanic crust being subducted where in general the older the crust, the cooler and more dense it will be and so less buoyant and will sink more steeply.
What does a 3.2 magnitude mean?
- 1 answer
3.2 on the Richter scale is relatively small quake often not even felt but just recorded by instruments.
Alternatively:
A 3.2 magnitude star is one that is about 0.052 times as bright as a magnitude 0 star. It is a logarithmic scale. The sun has relative magnitude of -27, the full moon -13, Venus (max) -5, Saturn (max) 0, the naked eye can see light to about 6, 7 x 50 binoculars to about 10, the Hubble space telescope to 32.
How far does the lithosphere plates move each year?
- 1 answer
~1 cm per year
Why were volcanoes made?
- 1 answer
Volcanoes are evidence of the ceaseless tectonic activity that our planet has. The molten core of the earth drives all of the processes we see, including volcanoes, earthquakes, even as high up as the northern lights. The heat that is inside of our planet is the driving force behind volcanoes, however volcanoes form in many different areas, and under many different conditions. Different types of volcanoes are evidence of different processes being present underground. However, to put it simply without the heat from the core of the earth there wouldn't be any volcanoes.
Why do subduction zones exist?
- 1 answer
Subduction zones exist for the same reason that any other form of tectonic activity exists, which is that the Earth's crust floats on top of a liquid mantle in which there are currents caused by temperature differences within the mantle, which in turn are the result of heat generated by radioactive decay within the Earth's interior. The currents cause the floating crustal plates to slowly move. If they move toward each other, sometimes one plate will slide on top of another, and the submerged plate therefore undergoes subduction.
What type of plate boundary causes a reverse fault?
- 1 answer
In an ideal world this would be a margin that involves some element of compression, so you're looking at a compressional (orogenic) or subducting margin. Anywhere where the crust is thickened generally involves reverse, also known as thrust, faulting.
How has technology help scientists explore earth?
- 1 answer
Lots of ways. One example is that scientists have shot semantic waves through Earths layers to find out how much velocity each layer has.
What is the continental drift valley?
- 1 answer
The hypothesis that the continents slowly move across Earth's surface.
A2. You are mixing two terms, Continental Drift, and Rift Valley. But both are related.
Continental Drift is as above, where the more-or-less rigid tectonic plates are moved across the Earth's surface by movement of the plastic magma beneath the earth's crust.
Rift Valley. Sometimes these tectonic movements cause a crack to develop in the surface crust, and it splits apart. This is currently happening in Africa, causing the Rift Valley. This is well below sea level, and is HOT, and has many volcanoes. Check out the Afar Depression in Wikipedia.
What month does 58 plate come out?
- 1 answer
1st September 2008
What is happening at oceanic spreading ridges?
- 1 answer
Two separate oceanic lithospheric plates are moving away from each other. As they separate, buoyant mantle material from the asthenosphere rises to fill the void. This material, which is extremely hot, but solid, and is under tremendous pressure, is decompressed as it rises, causing it to melt. When it rises to a point at or near the surface, this melt solidifies into new oceanic crust. The buoyancy of this hot new crust, coupled with its thinness, causes it to be pushed up higher over the asthenosphere than the surrounding landscape, forming ridges along the length of the divergent plate boundary. The mid-ocean ridges are the longest continuous mountain range on the planet.
Is Mexico part of the North American plate?
- 1 answer
yes it is along with eastern Siberia, the U.S., Canada, and half of Iceland.
Where do most earthquakes occur in the world?
- 2 answers
Most earthquakes occur along the edge of the oceanic and continental plates. The earth's crust is made up of several pieces, called plates. The plates under the oceans are called oceanic plates and the rest which are under the land surface are continental plates. The plates are moved around by the motion of a deeper part of the earth (the mantle) that lies underneath the crust. These plates are always bumping into each other, pulling away from each other, or past each other. The plates usually move at about the same speed that your fingernails grow. Earthquakes usually occur where two plates are running into each other or sliding past each other.
Earthquakes mostly occur in places where there is a Fault Line. Plates under the Earth's surface move and push against each other.
Some of these places are:
- South America
- North America
- Japan
- Australia
- Africa
- Philippines
- India
- Caribbean
- Haiti
Alaska is the most earthquake-prone state and one of the most seismically active regions in the world. Alaska experiences a magnitude 7 earthquake almost every year, and a magnitude 8 or greater earthquake on average every 14 years. or just this near subduction zones.
What is the middle mantle made of?
- 1 answer
How big is the crust of the earth?
- 1 answer
About 35km thick.
What happens at a convergent plate boundary?
- 1 answer
Tectonic plates collide at a convergent plate boundary.
Oceanic to oceanic plate convergence:
Where an oceanic plate collides with another oceanic plate, the more dense plate subducts into the mantle. The subduction results in the partial melting of lithospheric rock above the area of the subduction, causing underwater volcanoes to form. If the volcanoes grow to reach the surface, volcanic arc islands are formed.
Oceanic to continental plate convergence:
Where an oceanic plate collides with a continental plate, the oceanic plate is subducted due to the fact that it is more dense, which can also cause volcanism and mountain building.
Continental to continental plate convergence:
Where two continental plates collide, neither subducts into the mantle, the crust is thickened, and mountain ranges are formed from the thickening and uplift.
How do V-shape valleys form?
- 1 answer
by water running over and under the same place
What are facts about Earth's mantle?
- 1 answer
The mantle can be subdivided into the upper and lower mantle.
The uppermost part of the upper mantle is part of the lithosphere, and is sold and rigid. The lower part of the upper mantle is partially molten, and hence can flow.
The lower mantle is solid, but behaves in a plastic fashion, much like blu-tack.
The mantle is predominantly composed of an ultramafic rock called peridotite.
Further Detail:
The Earth's mantle is the largest layer of the Earth by volume accounting for around 84% of the Earth. It is approximately 2885 kilometers thick.
The Earth's mantle is composed of rocks that have higher concentrations of mafic minerals (containing iron and magnesium) and lower in concentrations of the felsic minerals (aluminum and silica) than the rocks of Earth's crust.
The concentrations of the above elements therefore mean that the Earth's mantle is composed of a series of minerals that are predominately calcium / iron / magnesium aluminum silicates.
Such as:
- Olivine - (Mg,Fe)2SiO4
- Pyroxene - X(Si,Al)2O6, where X represents either calcium, sodium, iron or magnesium
- Spinel - MgAl2O4
- Garnet - X3Y2(SiO4)3 where X and Y can be a mixture of aluminum, iron, calcium, manganese or magnesium.
At depths shallower than approximately 460 km, these minerals form the rocks types Peridotite, Dunite (Olivine-rich Peridotite), and Eclogite.
At depths greater than 410 km Olivine becomes unstable and is replaced by a number of different mineral forms known as poly-morphs which are stable at higher pressures. These include Wadsleyite which forms at depths between 410 and 520 km and Ringwoodite which forms between 520 and 600 km deep.
These depths are based on a number of seismic dicontinuities at the depths of 410 km (thought to mark the transition from Olivine to Wadsleyite) and at 520 km (thought to mark the transition from Wadsleyite to Ringwoodite) respectively.
At depths greater than around 650 km these upper mantle minerals start to become unstable due to the increased pressure and the minerals below this take the structure of the minerals Perovskite and Ferropericlase although with differing chemical compositions and it is this seismic discontinuity at 650 km depth that marks the transition to the lower mantle.
Its heat comes from left over radiation from the Earth's creation.
It is more denser than the crust. not
It contains more iron than silica.
It is 1800 miles thick and makes up more than two thirds of earts mass
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