- Who discovered the seafloor spreading?
- What boundaries destroy seafloor?
- What is the main cause of seafloor spreading?
- What is it called when new crust is created?
- Where is active seafloor spreading occurring today?
- Why is there no ocean floor much older than 280 million years?
- Where is the youngest crust on Earth is found?
- Why does the ocean floor have different ages?
- What are the three types of seafloor spreading?
- What is the importance of seafloor spreading?
- What is the first step of seafloor spreading?
- What happens when the seafloor spreads?
- How does the age of the ocean floor support the theory of ocean floor spreading?
- Does seafloor spreading add new material to the ocean floor?
- What is the average speed of seafloor spreading?
- How old is the oldest sea floor?
- What discovery about the ocean floor is associated with seafloor spreading?
- What is the theory of seafloor spreading?
Who discovered the seafloor spreading?
Harry HessHarry Hess: One of the Discoverers of Seafloor Spreading main content..
What boundaries destroy seafloor?
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 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. Eventually, the crust cracks.
What is it called when new crust is created?
Divergent boundaries — where new crust is generated as the plates pull away from each other. Convergent boundaries — where crust is destroyed as one plate dives under another.
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.
Why is there no ocean floor much older than 280 million years?
The oldest oceanic crust is about 260 million years old. This sounds old but is actually very young compared to the oldest continental rocks, which are 4 billion years old. … It is due to the process of subduction; oceanic crust tends to get colder and denser with age as it spreads off the mid-ocean ridges.
Where is the youngest crust on Earth is 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.
Why does the ocean floor have different ages?
Scientists use the magnetic polarity of the sea floor to determine the age. Very little of the sea floor is older than 150 million years. This is because the oldest sea floor is subducted under other plates and replaces by new surfaces.
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 is the importance of seafloor spreading?
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.
What is the first step of seafloor spreading?
Also Know, what is the first step of seafloor spreading quizlet? Sea-Floor Spreading begins at a mid-ocean ridge, which forms along a crack in the oceanic crust. along the ridge, molten material that forms several kilometers beneath the surface rises and erupts.
What happens when the seafloor spreads?
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.
How does the age of the ocean floor support the theory of ocean floor 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.
Does seafloor spreading add new material to the ocean floor?
Harry Hess, an American geologist, was one of the scientists who studied mid-ocean ridges. … He suggested that a process he called sea-floor spreading continually adds new material to the ocean floor. In sea-floor spreading, the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added.
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.
How old is the oldest sea floor?
approximately 280 million yearsThe 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 discovery about the ocean floor is associated with seafloor spreading?
The magnetic history of the earth is thus recorded in the spreading ocean floors as in a very slow magnetic tape recording, forming a continuous record of the movement of the ocean floors. Other supportive evidence has emerged from study of the fracture zones that offset the sections of the ridge.
What is the theory of seafloor spreading?
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. …