What is the average seafloor spreading rate?
It spreads about 6-16 centimeters (3-6 inches) every year. There is not an ocean trench at the East Pacific Rise, because the seafloor spreading is too rapid for one to develop!
Is the rate of seafloor spreading constant?
These age data also allow the rate of seafloor spreading to be determined, and they show that rates vary from about 0.1 cm (0.04 inch) per year to 17 cm (6.7 inches) per year. Seafloor-spreading rates are much more rapid in the Pacific Ocean than in the Atlantic and Indian oceans.
On what time scale does seafloor spreading occur?
Seafloor spreading leads to the renewal of the ocean floor in every 200 million years, a period of time for building a mid-ocean ridge, moving away across the ocean and subduction into a trench.
What is the average rate of seafloor spreading occurring in the Atlantic Ocean and in the Pacific Ocean at the East Pacific Rise?
the average rate of seafloor spreading occurring in the Atlantic Ocean and in the Pacific Ocean at the East Pacific Rise? The rate of seafloor spreading at the Mid-Atlantic Ridge is 2 centimeters per year, whereas the rate of seafloor spreading at the East Pacific Rise is 15 centimeters per year.
What is a typical rate for seafloor spreading quizlet?
Average rate of seafloor spreading is 1 meter per year.
What is seafloor spreading quizlet?
sea-floor spreading. the process by which molten material adds new oceanic crust to the ocean floor.
What is the typical rate of plate movement?
They move at a rate of one to two inches (three to five centimeters) per year.
What has the average rate of spreading along the Mid-Atlantic Ridge?
about 2.5 centimeters per year The rate of spreading along the Mid-Atlantic Ridge averages about 2.5 centimeters per year (cm/yr), or 25 km in a million years.
How are the rates of seafloor spreading related to changes in sea level quizlet?
How do the rates of seafloor spreading relate to changes in sea level? As the rates of seafloor spreading increase, the sea level rises.
What is the sea floor spreading theory?
seafloor spreading, theory that oceanic crust forms along submarine mountain zones, known collectively as the mid-ocean ridge system, and spreads out laterally away from them.
What is the rate of movement?
As we can say, objects moving with different rate will take different amount of time to cover a given distance. Hence, one of the ways of measuring the rate of motion of an object is to find out the distance travelled by the object in unit time. This quantity is defined as speed.
What is the typical rate of plate movement quizlet?
1-18 centimeters a year. You just studied 15 terms!
What has the average rate of spreading along the Mid-Atlantic Ridge at 20?
The rate of seafloor spreading at the Mid-Atlantic Ridge is 2 centimeters per year, whereas the rate of seafloor spreading at the East Pacific Rise is 15 centimeters per year.
How long is Mid-Atlantic Ridge?
about 10,000 miles The Mid-Atlantic Ridge is in effect an immensely long mountain chain extending for about 10,000 miles (16,000 km) in a curving path from the Arctic Ocean to near the southern tip of Africa. The ridge is equidistant between the continents on either side of it.
How do the rates of seafloor spreading relate to changes in sea level?
The increased rate of seafloor spreading caused sea level to rise. Increasing the rate of seafloor spreading inflates the ridge. Hot, young lithosphere is forming and moving away from the ridge at a faster rate and moves a greater distance from the ridge before it cools and contracts.
Where do seafloor spreading occur?
Sea-floor spreading is what happens at the mid-oceanic ridge where a divergent boundary is causing two plates to move away from one another resulting in spreading of the sea floor.
Where is active seafloor spreading today?
Where is active sea floor spreading occurring today? Seafloor spreading is the movement of old rock that is being pushed by the new young oceanic crust. This would be a divergent since the plates are separating from each other. Active seafloor spreading is occurring at mid-ocean ridges.
What is the average rate of plate movement?
At an average rate of 33 feet per 100 years (about 10 cm/year), a tectonic plate can move 62.5 miles (about 100 km) in 1 million years. Such rates seem slow, but over the course of several million years, a tectonic plate can move into an entirely different climate regime.
What is the average movement of tectonic plates per year?
They move at a rate of one to two inches (three to five centimeters) per year.
What is a typical rate of plate movement?
They move at a rate of one to two inches (three to five centimeters) per year.
Which is the most typical rate of tectonic plate motion?
Plate Tectonics – A Scientific Revolution. The majority of the research shows that the plates move at the average rate of between approximately 0.60 cm/yr to 10 cm/yr.
Where do some rift valleys form along the oceanic ridge system?
Over millions of years, the Mid-Atlantic Ridge has formed rift valleys as wide as 15 kilometers (9 miles). In the Pacific Ocean, the East Pacific Rise has created rift valleys where the Pacific plate is separating from the North American plate, Cocos plate, Nazca plate, and Antarctic plate.
How does the rate of seafloor spreading affect sea level quizlet?
How does the rate of seafloor spreading affect the sea level? Faster spreading produces broader ridges that displace water and expand the oceans.
How do the rates of seafloor spreading relate to changes in sea level quizlet?
How do the rates of seafloor spreading relate to changes in sea level? As the rates of seafloor spreading increase, the sea level rises.
Where does seafloor spreading occur quizlet?
Where does seafloor spreading occur? This process occurs along divergent plate boundaries at areas called mid-ocean ridges.
What is sea floor spreading theory?
seafloor spreading, theory that oceanic crust forms along submarine mountain zones, known collectively as the mid-ocean ridge system, and spreads out laterally away from them.
Why does seafloor spreading occur?
Sea-floor spreading is what happens at the mid-oceanic ridge where a divergent boundary is causing two plates to move away from one another resulting in spreading of the sea floor. As the plates move apart, new material wells up and cools onto the edge of the plates.
What is the name of the single landmass that once existed some 250 million years ago?
Pangaea Pangea, also spelled Pangaea, in early geologic time, a supercontinent that incorporated almost all the landmasses on Earth. Pangea was surrounded by a global ocean called Panthalassa, and it was fully assembled by the Early Permian Epoch (some 299 million to about 273 million years ago).
Do plates move about 2 to 5 centimeters per year?
The movement of the plates creates three types of tectonic boundaries: convergent, where plates move into one another; divergent, where plates move apart; and transform, where plates move sideways in relation to each other. They move at a rate of one to two inches (three to five centimeters) per year.
What is the total length of the Great East African rift valley from Syria to Mozambique?
approximately 7,000 kilometres The Great Rift Valley is a series of contiguous geographic trenches, approximately 7,000 kilometres (4,300 mi) in total length, that runs from Lebanon in Asia to Mozambique in Southeast Africa.