What are the three types of seafloor spreading?

Inhaltsverzeichnis:

1. What are the three types of seafloor spreading?
2. Why is seafloor spreading important?
3. What are the steps in the process of seafloor spreading?
4. Where is active seafloor spreading occurring today?
5. What are the features of seafloor?
6. Why do you think it would be important to know what the seafloor looks like?
7. What is the seafloor called?
8. Who proved the seafloor spreading?
9. What causes the plate to move?
10. Why is the earth not getting bigger or smaller?
11. Which of the following is not evidence of seafloor spreading?
12. At which type of boundaries is seafloor destroyed?
13. What is the source of magma for seafloor spreading?
14. What evidence supports Hess's theory of seafloor spreading?
15. Which is one piece of evidence of seafloor spreading?
16. What are the lines of evidence that support the plate movement?
17. What do magnetic stripes confirm?
18. What kind of rock is the seafloor made?
19. How old is the youngest seafloor?
20. How was seafloor determined?
21. Where is the youngest seafloor located?
22. Where is the oldest seafloor located?
23. What is seafloor made of?
24. What are 4 types of ocean floor?
25. Which crust is thicker?
26. How long would it take to empty the ocean with a spoon?
27. Which is the deadliest ocean?

What are the three types of seafloor spreading?

There are three types of plate-plate interactions based upon relative motion: convergent, where plates collide, divergent, where plates separate, and transform motion, where plates simply slide past each other.

Why is seafloor spreading important?

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. ... At a spreading center, basaltic magma rises up the fractures and cools on the ocean floor to form new seabed.

What are the steps in the process of seafloor spreading?

What are the steps in the process of sea floor spreading?

1. Magma comes out of the rift valley.
2. Magma cools to rock and hardens.
3. Rock is pushed away as new rock is formed at MOR.
4. Oceanic crust and continental crust meet at the trench.
5. Oceanic crust bends down under the continental crust.
6. Gravity pulls rock towards mantle.
7. Rock melts to mantle.

Where is active seafloor spreading occurring 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 are the features of seafloor?

Features of the ocean include the continental shelf, slope, and rise. The ocean floor is called the abyssal plain. Below the ocean floor, there are a few small deeper areas called ocean trenches. Features rising up from the ocean floor include seamounts, volcanic islands and the mid-oceanic ridges and rises.

Why do you think it would be important to know what the seafloor looks like?

Sea floor sediment provide an invaluable key to past climate change. Finely varved sediments from areas of rapid deposition provide a high-resolution record of past climate variation, and volcanic ash layers contribute to the comprehensive study of climate change on relatively short timescales.

What is the seafloor called?

seabeds

Who proved the seafloor spreading?

Harry H. Hess

What causes the plate to move?

The heat from radioactive processes within the planet's interior causes the plates to move, sometimes toward and sometimes away from each other. This movement is called plate motion, or tectonic shift.

Why is the earth not getting bigger or smaller?

New crust is continually being pushed away from divergent boundaries (where sea-floor spreading occurs), increasing Earth's surface. But the Earth isn't getting any bigger. ... Deep below the Earth's surface, subduction causes partial melting of both the ocean crust and mantle as they slide past one another.

Which of the following is not evidence of seafloor spreading?

Harry Hess's hypothesis about seafloor spreading had collected several pieces of evidence to support the theory. So, the distribution of ice sheets across the planet is not evidence of sea-floor spreading.

At which type of boundaries is seafloor destroyed?

At convergent plate boundaries, oceanic crust is often forced down into the mantle where it begins to melt. Magma rises into and through the other plate, solidifying into granite, the rock that makes up the continents. Thus, at convergent boundaries, continental crust is created and oceanic crust is destroyed.

What is the source of magma for seafloor spreading?

Sea-floor spreading — In the early 1960s, Princeton geologist Harry Hess proposed the hypothesis of sea-floor spreading, in which basaltic magma from the mantle rises to create new ocean floor at mid-ocean ridges.

What evidence supports Hess's theory of seafloor spreading?

Evidence supported Hess's theory of sea-floor spreading: eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves.

Which is one piece of evidence of seafloor spreading?

There is lots of evidence that proves that seafloor spreading is occurring. One piece of evidence is mid-ocean ridges. Rocks found near mid-ocean ridges are young and get older as the distance from the ocean ridge increases.

What are the lines of evidence that support the plate movement?

Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed. Some life "rode" on diverging plates, became isolated, and evolved into new species.

What do magnetic stripes confirm?

When the Earth's magnetic field reverses, a new stripe, with the new polarity, begins. Such magnetic patterns led to recognition of the occurrence of sea-floor spreading, and they remain some of the strongest evidence for the theory of plate tectonics.

What kind of rock is the seafloor made?

As old oceanic crust is subducted and melted into magma, new oceanic crust in the form of igneous rock is formed at mid-ocean ridges and volcanic hotspots.

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.

How was seafloor determined?

Scientists can determine the age of the seafloor by examining the changing magnetic field of our planet. ... While it cools down, it records the magnetic field during its formation. The two parts of the oceanic plate are pulled apart, and magnetic stripes become older as they move away from the mid-ocean ridge.

Where is the youngest seafloor located?

Seafloor is youngest near the mid-ocean ridges and gets progressively older with distance from the ridge. Orange areas show the youngest seafloor. The oldest seafloor is near the edges of continents or deep sea trenches.

Where is the oldest seafloor located?

Mediterranean Sea

What is seafloor made of?

Oceanic crust is about 6 km (4 miles) thick. It is composed of several layers, not including the overlying sediment. The topmost layer, about 500 metres (1,650 feet) thick, includes lavas made of basalt (that is, rock material consisting largely of plagioclase [feldspar] and pyroxene).

What are 4 types of ocean floor?

Features of the ocean floor include the continental shelf and slope, abyssal plain, trenches, seamounts, and the mid-ocean ridge. The ocean floor is rich in resources. Living things on the ocean floor are used for food or medicines.

Which crust is thicker?

Earth's crust is generally divided into older, thicker continental crust and younger, denser oceanic crust. The dynamic geology of Earth's crust is informed by plate tectonics.

How long would it take to empty the ocean with a spoon?

Assuming that it takes 10s (we could argue about how accurate that is, but trust me it doesn't make too much of a difference to the final conclusion) to move a teaspoon of seawater into a truly ginormous container that magically appears to contain it all, it will take approximately 2.

Which is the deadliest ocean?

The South China Sea and East Indies, eastern Mediterranean, Black Sea, North Sea, and British Isles are the most dangerous seas in the world, with the greatest number of shipping accidents in the last 15 years, according to a report released by the World Wildlife Fund (WWF).