What is the average rate of seafloor spreading in modern oceans quizlet?
What is the average rate of seafloor spreading in modern oceans? 5 centimeters per year. List four features that characterize the oceanic ridge system.
What is the rate of seafloor spreading in the Atlantic Ocean?
Because of seafloor spreading and the movement of the ocean floor and of the continents outward from the ridge the Atlantic Basin is widening at an estimated rate of 1 to 10 cm (0.5 to 4 inches) a year.
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.
Does the seafloor spread at a constant rate?
As a general rule, fast ridges have spreading (opening) rates of more than 90 mm/year. Intermediate ridges have a spreading rate of 40–90 mm/year while slow spreading ridges have a rate less than 40 mm/year. The highest known rate was over 200 mm/yr during the Miocene on the East Pacific Rise.
What is a typical rate for seafloor spreading quizlet?
Average rate of seafloor spreading is 1 meter 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.
What is the average rate of seafloor spreading in cm yr?
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.
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 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 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.
Is the Atlantic Ocean expanding or contracting?
The Atlantic is expanding by a couple of inches a year. The Atlantic Ocean is getting wider, shoving the Americas to one side and Europe and Africa to the other.
What is the average rate of seafloor spreading in cm yr west of the Juan de Fuca Ridge from B to A?
The magmatic products that are brought up from beneath form new seafloor along the Juan de Fuca ridge, on the western edge of the Juan de Fuca plate. The principal lava types in this region are lobate and pillow flows. The Juan de Fuca spreading system has a full spreading rate of 6 cm per year.
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).
What is the oldest seafloor?
The oldest seafloor is comparatively very young, approximately 280 million years old. It is found in the Mediterranean Sea and is a remnant of an ancient ocean that is disappearing between Africa and Europe.
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!
Is Pacific Ocean shrinking?
On the other hand, the much older Pacific Ocean is currently estimated to be shrinking by two to three centimetres each year. Again, this comes down to plate tectonics because the Pacific Ocean has subduction zones on three sides — where the Pacific plate submerges beneath other plates.
Is the Pacific closing?
Most researchers agree that the next major oceanic basin which is set to close is the Pacific. The Americas (to the east) are moving towards East Asia and Australia at a rate of 3-4 cm yr-1, so it should close in roughly 300 million years.
What did the Earth look like 100 million years ago?
IF you could visit Earth as it was 100 million years ago, you wouldn't recognize it. At that time our now-temperate planet was a hothouse world of dense jungle and Sahara-like desert overrun by dinosaurs. This period, the Cretaceous, has long fascinated scientist and layman alike.
Do continents fit like a puzzle?
The east coast of South America and the west coast of Africa seem to fit together like pieces of a jigsaw puzzle, and Wegener discovered their rock layers “fit” just as clearly. South America and Africa were not the only continents with similar geology.
Why is the oldest ocean floor only 200 million years old?
While the Earth's continental crust can exist for billions of years, movement of tectonic plates causes subduction, which is when the ocean crust is shoved down into the molten mantle. So the ocean floor rarely lasts longer than 200 million years.
What is the youngest ocean?
The Indian Ocean is the smallest, geologically youngest, and physically most complex of the world's three major oceans (the others being the Pacific and Atlantic). Although it first opened some 140 million years ago, almost all of the Indian Ocean basin is less than 80 million years old.
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 rate of plate motion?
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.
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.
Is Africa getting closer to Europe?
For millions of years the African plate, which contains part of the Mediterranean seabed, has been moving northward toward the Eurasian Plate at a rate of about an inch every 2.5 years (a centimeter a year).
Is the Indian Ocean getting bigger?
Since 1880, sea level in the world's oceans has risen about nine inches. But one pocket of the Indian Ocean has puzzled scientists for the last 40 years. The Arabian Sea and the Bay of Bengal rose four inches more than the world's oceans — a total of 13 inches to date.
How will the earth look in 250 million years?
2:458:43What will the world look like in 250 million years? – YouTubeYouTube
What will the continents look like in 200 million years?
One possibility is that, 200 million years from now, all the continents except Antarctica could join together around the north pole, forming the supercontinent “Amasia.” Another possibility is that “Aurica” could form from all the continents coming together around the equator in about 250 million years.
What will happen in 1 googol?
The universe will die. Eventually it will become nothing. In roughly a quadrillion years, a last star will give its last twinkle, and black holes will devour everything before they completely evaporate. And in a googol years (that's 10 to the hundredth power, which is a lot), the universe will be empty.