Rift Valleys When divergent boundaries occur in continental plates, a different geological feature, called a rift valley, is formed.
What geological feature is formed at the two side slits?
Rift Valleys When divergent boundaries occur in continental plates, a different geological feature, called a rift valley, is formed.
What feature of the ocean floor does the center slit stand for what prominent feature of the ocean floor is missing from the model at this point?
What feature on the ocean floor does the center slit stand for? central valley of mid-ocean ridge where molten material is upwelling from below.
Why does the ocean floor break and spread sideways?
Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor.Why is the continental drift theory important to seafloor spreading?
Significance. Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere. … Older rocks will be found farther away from the spreading zone while younger rocks will be found nearer to the spreading zone.
What are the possible geological events and features that are produced when two lithospheric plates move apart?
When two plates are moving away from each other, we call this a divergent plate boundary. Along these boundaries, magma rises from deep within the Earth and erupts to form new crust on the lithosphere. Most divergent plate boundaries are underwater and form submarine mountain ranges called oceanic spreading ridges.
What are two geological processes that happen at convergent plate boundaries?
A convergent plate boundary is a location where two tectonic plates are moving toward each other, often causing one plate to slide below the other (in a process known as subduction). The collision of tectonic plates can result in earthquakes, volcanoes, the formation of mountains, and other geological events.
What ocean structure is this depression and what process happens here?
What ocean structure is this depression and what process happens here? A. The depression is a trench where new oceanic crust is formed. … The depression is a mid-oceanic ridge where old seafloor sinks back down to the Earth’s interior.What process is involved when the oceanic crust plunges down into the mantle?
This process, called subduction, occurs at the oceanic trenches (figure 6). The entire region is known as a subduction zone. Subduction zones have a lot of intense earthquakes and volcanic eruptions. The subducting plate causes melting in the mantle.
Why is the floor of the Atlantic ocean older at the edges?The theory explaining this relationship holds that the increase in depth with age is due to the thermal contraction of the oceanic crust and upper mantle as they are carried away from the seafloor spreading centre in an oceanic plate.
Article first time published onWhat does the middle slit represent what process happens to this part?
The center slit represents a Mid-Ocean Ridge 2. … Seafloor spreading is the creation of new seafloor or new oceanic crust 5. The earth does not get bigger.
How does density and temperature affect sea floor spreading?
The cooler denser mantle sinks causing subduction and the hotter mantle rises to the surface causing sea floor spreading.
What is the role of the mid-ocean ridge in the movement of lithospheric plates?
Mid-ocean ridges are the longest, largest and most voluminous magmatic environment on Earth. Ridges are the site of new lithospheric and crustal production that may be subsequently subducted into the mantle and recycled, or involved in magma-producing dehydration reactions that slowly build up continental crust (Fig.
What happen when the magma flows out from the crack when the seafloor is pulled apart?
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. The magma also spreads outward, forming new ocean floor and new oceanic crust.
What causes the tectonic plates to move?
The plates can be thought of like pieces of a cracked shell that rest on the hot, molten rock of Earth’s mantle and fit snugly against one another. The heat from radioactive processes within the planet’s interior causes the plates to move, sometimes toward and sometimes away from each other.
What forces responsible for the movement of plates?
Heat and gravity are fundamental to the process Lithospheric plates are part of a planetary scale thermal convection system. The energy source for plate tectonics is Earth’s internal heat while the forces moving the plates are the “ridge push” and “slab pull” gravity forces.
What is the process of convergent boundary?
A convergent boundary (also known as a destructive boundary) is an area on Earth where two or more lithospheric plates collide. One plate eventually slides beneath the other, a process known as subduction. … Subduction begins when this dense crust converges with less dense crust.
What happens at convergent boundaries?
Convergent (Colliding): This occurs when plates move towards each other and collide. When a continental plate meets an oceanic plate, the thinner, denser, and more flexible oceanic plate sinks beneath the thicker, more rigid continental plate. This is called subduction.
What happens at a divergent tectonic plate boundary?
Divergent boundaries occur along spreading centers where plates are moving apart and new crust is created by magma pushing up from the mantle. Picture two giant conveyor belts, facing each other but slowly moving in opposite directions as they transport newly formed oceanic crust away from the ridge crest.
What happens to the lithospheric plates as it gets contact to the rising hot materials?
When the plates move they collide or spread apart allowing the very hot molten material called lava to escape from the mantle. When collisions occur they produce mountains, deep underwater valleys called trenches, and volcanoes.
What will happen to the crust if two plates move towards each other?
When two plate move towards each other they converge or come together. The collision between two plates that are moving towards each other is called a convergent boundary. … The collision results in large damaging earthquakes. When two continental plates converge the result is the formation of large folded mountains.
What happens when two plates slide or grind past each?
When oceanic or continental plates slide past each other in opposite directions, or move in the same direction but at different speeds, a transform fault boundary is formed. No new crust is created or subducted, and no volcanoes form, but earthquakes occur along the fault.
What is formed on the oceanic side when oceanic and continental crust collide?
When an ocean plate collides with another ocean plate or with a plate carrying continents, one plate will bend and slide under the other. This process is called subduction. A deep ocean trench forms at this subduction boundary.
What is this process oceanic crust destruction called?
Just as oceanic crust is formed at mid-ocean ridges, it is destroyed in subduction zones. Subduction is the important geologic process in which a tectonic plate made of dense lithospheric material melts or falls below a plate made of less-dense lithosphere at a convergent plate boundary.
What was formed when oceanic plate converges with another oceanic plate?
When two oceanic plates converge, the denser plate will end up sinking below the less dense plate, leading to the formation of an oceanic subduction zone. … Whenever a subduction zone is formed, the subducted plate will end up being partially melted by the earth’s internal magma and molten.
What is an ocean trench and how is it formed?
Ocean trenches are long, narrow depressions on the seafloor. … At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench.
What happens to oceanic crust at a deep-ocean trench?
What happens to oceanic crust at a deep-ocean trench? At a deep-ocean trench, the oceanic crust bends downward. In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep-ocean trenches.
What is a depression landform?
In geology, a depression is a landform sunken or depressed below the surrounding area. Depressions form by various mechanisms. … Glacial valley: a depression carved by erosion by a glacier. River valley: a depression carved by fluvial erosion by a river.
How old is the youngest sea floor?
Scientists use the magnetic polarity of the sea floor to determine the age. Very little of the sea floor is older than 150 million years. This is because the oldest sea floor is subducted under other plates and replaces by new surfaces.
Why is the earth not getting bigger?
Thanks to our leaky atmosphere, Earth loses several hundred tons of mass to space every day, significantly more than what we’re gaining from dust. So, overall, Earth is getting smaller.
How old is the youngest seafloor?
Because of this correlation between age and subduction potential, very little ocean floor is older than 125 million years and almost none of it is older than 200 million years.
