What helped confirm seafloor spreading?
Earthquake zones [175 k] The recognition of such a connection helped confirm the seafloor-spreading hypothesis by pin-pointing the zones where Hess had predicted oceanic crust is being generated (along the ridges) and the zones where oceanic lithosphere sinks back into the mantle (beneath the trenches).
Why is Iceland a useful place to conduct research on seafloor spreading?
why might geologists find Iceland a useful place to conduct research on seafloor spreading? scientists suggest that differences in density cause hot, plasticlike rock to be forced upward toward the surface, cool, and sink.
What discovery about the ocean floor is associated with seafloor spreading?
magnetic stripes
What are the two evidence of seafloor spreading?
Harry Hess’s hypothesis about seafloor spreading had collected several pieces of evidence to support the theory. This evidence was from the investigations of the molten material, seafloor drilling, radiometric age dating and fossil ages, and the magnetic stripes.
What is the main cause of seafloor spreading?
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.
What are the steps of seafloor spreading?
What are the 4 steps of seafloor spreading?
- Magma comes out of the rift valley.
- Magma cools to rock and hardens.
- Rock is pushed away as new rock is formed at MOR.
- Oceanic crust and continental crust meet at the trench.
- Oceanic crust bends down under the continental crust.
- Gravity pulls rock towards mantle.
Is the seafloor always changing?
These processes have always happened, and they will continue until the earth ends, as far as we know. Seafloor spreading and subduction cause the seafloor to move and change. These factors have not changed overtime, and probably won’t ever (unless the world explodes).
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.
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 is Earth not growing in spite of seafloor spreading?
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?
Your answer: The distribution of ice sheets across the planet is not an evidence of sea-floor spreading.
Which is one piece of evidence of seafloor spreading Brainly?
Explanation: Eruptions of molten material, which results in continent material is a piece of evidence of seafloor spreading.
Why do continents move?
Today, we know that the continents rest on massive slabs of rock called tectonic plates. The plates are always moving and interacting in a process called plate tectonics. The continents are still moving today. As the seafloor grows wider, the continents on opposite sides of the ridge move away from each other.
What is seafloor spreading Quizizz?
The process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle again. Seafloor spreading is consistent at all mid-ocean ridges.
Which is the source of new material during the process of seafloor spreading?
Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.
What is the oldest seafloor?
approximately 280 million years old
Where would seafloor spreading most likely occur quizzes?
mid-oceanic ridges
Which best describes an ocean trench *?
Which best describes an ocean trench? A deep, curved depression near the margin of a continent or chain of volcanic islands. Lava erupts from the mid-ocean ridge and is carried away as the floor of the ocean spreads apart.