How does its presence in the Central Valley of mid-ocean ridges support the idea of sea floor spreading?

How does its presence in the Central Valley of mid-ocean ridges support the idea of sea floor spreading?

Scientists have found strange rocks shaped like pillows in the central valley of mid-ocean ridges. Such rocks can form only if molten material hardens quickly after erupting under water. The presence of these rocks supports the theory of sea-floor spreading.

What evidence do the rocks on either side of a mid-ocean ridge have that supports the theory of sea floor spreading?

What they discovered was that the magnetism of the ocean floor around mid-ocean ridges was divided into matching “stripes” on either side of the ridge. The specific magnetism of basalt rock is determined by the Earth’s magnetic field when the magma is cooling.

What is one way that mid-ocean ridges provide evidence of sea floor spreading?

In sea-floor spreading, the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added. 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.

What provides evidence of sea floor spreading?

The age of Earth’s oceanic crust can be presented to show the pattern of seafloor spreading at the global scale. Encyclopædia Britannica, Inc. Measurements of the thickness of marine sediments and absolute age determinations of such bottom material have provided additional evidence for seafloor spreading.

What does the presence of new rock near an oceanic ridge?

Ridges form along cracks (divergent boundaries) in the oceanic crust (Molten rock (magma) rises through these cracks and pushes to both sides. When it cools, it forms new oceanic crust. The old crust is pushed away and new crust takes over. This is called Sea-Floor Spreading.

Does molten material erupt inside the central valley of mid-ocean ridges?

Molten material erupts INSIDE the central valley of mid-ocean ridges. The farther from a mid-ocean ridge a rock sample is taken, the YOUNGER the rock is. Sea-floor spreading occurs at MID-OCEAN RIDGES. The pattern of magnetic stripes in rocks on either side of a mid-ocean ridge is THE SAME.

What process takes place at mid-ocean ridges?

A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.

When examining rocks from both sides of the Mid Atlantic ridge scientists found evidence for the phenomenon of?

2. Examining rocks that form on either side of the Mid-Atlantic Ridge provides evidence of plate movement that supports the theory of plate tectonics.

How do ocean floor rocks and sediments provide evidence of seafloor spreading?

2. Explain how ocean-floor rocks and sediments are evidence of seafloor spreading. BOTH SEDIMENT THICKNESS AND THE AGES OF OCEAN-FLOOR ROCKS INCREASE WITH DISTANCE FROM THE RIDGE. THESE DATA ARE CONSISTENT WITH NEW CRUST FROMING AT RIDGES AND BEING DESTROYED AT TRENCHES.

Why are rocks next to the mid-ocean ridge younger than those farther away from the ridge?

The scientists found that the farther the rocks the older the rocks were,so the youngest rocks were found near the mid-ocean ridge. This showed that sea-floor spreading took place because that fact that rocks were because pushed out showed us that the sea-floor was spreading.

When examining rocks from both sides of the Mid-Atlantic Ridge scientists found evidence for the phenomenon of?

What are three kinds of evidence of the ocean floor spreading?

Several types of evidence from the oceans supported Hess’s theory of sea-floor spreading-evidence from molten material, magnetic stripes, and drilling samples.

How did scientists discover the spreading of the seafloor?

The age, density, and thickness of oceanic crust increases with distance from the mid-ocean ridge. The magnetism of mid-ocean ridges helped scientists first identify the process of seafloor spreading in the early 20th century.

Why does seafloor spreading occur at divergent plate boundaries?

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.

How is the East Pacific Rise different from the Mid Atlantic Ridge?

Rapidly spreading ridges have a much more gentle slopes. The Mid-Atlantic Ridge, for instance, is a slow spreading center. It spreads 2-5 centimeters (.8-2 inches) every year and forms an ocean trench about the size of the Grand Canyon. The East Pacific Rise, on the other hand, is a fast spreading center.

How is seafloor spreading related to mantle convection?

Vocabulary Seafloor spreading is a geologic process in which tectonic plate s—large slabs of Earth’s lithosphere —split apart from each other. Seafloor spreading and other tectonic activity processes are the result of mantle convection. Mantle convection is the slow, churn ing motion of Earth’s mantle.