- Who were the two scientists who proposed the theory of seafloor spreading?
- What is seafloor spreading and who is responsible for the theory?
- What is the concept of seafloor spreading?
- Where does seafloor spreading happen?
- Where is the youngest material in the seafloor found?
- What is the average speed of seafloor spreading?
- Where is active seafloor spreading today?
- Who discovered seafloor spreading?
- How did scientists prove the theory of seafloor spreading?
- Why is the ocean floor not flat?
- What causes tectonic plates to move?
- Does the Earth get bigger because of seafloor spreading?
- What are the steps in the process of seafloor spreading?
Who were the two scientists who proposed the theory of seafloor spreading?
The idea that the seafloor itself moves and also carries the continents with it as it spreads from a central rift axis was proposed by Harold Hammond Hess from Princeton University and Robert Dietz of the U.S.
Naval Electronics Laboratory in San Diego in the 1960s.
The phenomenon is known today as plate tectonics..
What is seafloor spreading and who is responsible for the theory?
Seafloor spreading is the mechanism by which new seafloor lithosphere is constantly being created at mid-ocean ridges. This theory, introduced by Harry Hess, was proven as patterns of magnetic field polarity preserved in seafloor basalt and by age dating of the rocks.
What is the concept of seafloor spreading?
Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth’s lithosphere—split apart from each other. … Convection currents also “recycle” lithospheric materials back to the mantle. Seafloor spreading occurs at divergent plate boundaries.
Where does seafloor spreading happen?
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.
Where is the youngest material in the seafloor found?
The youngest crust of the ocean floor can be found near the seafloor spreading centers or mid-ocean ridges. As the plates split apart, magma rises from below the Earth’s surface to fill in the empty void.
What is the average speed of seafloor spreading?
approximately 5 centimeters a yearThe average speed of seafloor spreading is approximately 5 centimeters a year. This growth rate can be compared to the growth rate of human fingernails (Krupicka). The global ridge system consists of oceanic ridges. Seafloor spreading occurs at these elevated oceanic ridges and has high heat flow and volcanism.
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.
Who discovered seafloor spreading?
Harry HessHarry Hess was a geologist and Navy submarine commander during World War II. Part of his mission had been to study the deepest parts of the ocean floor. In 1946 he had discovered that hundreds of flat-topped mountains, perhaps sunken islands, shape the Pacific floor.
How did scientists prove the theory of seafloor spreading?
Several types of 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. This evidence led scientists to look again at Wegener’s hypothesis of continental drift.
Why is the ocean floor not flat?
The difference is sea level is caused by two major factors: tides and ocean currents. Tides are mainly caused by the gravitational pull of the Moon and the Sun, acting on the Earth’s surface. Ocean currents are caused by winds and a mixing of waters with different densities.
What causes tectonic plates 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.
Does the Earth get bigger because 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.
What are the steps in the process of seafloor spreading?
What are the steps in the process of sea floor 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.Rock melts to mantle.