What happens to old crust as new molten material rises from the mantle?

What happens to old crust as new molten material rises from the mantle?

What happens to old oceanic crust as new molten material rises from the mantle? The molten material spreads out, pushing older rock to both sides of the ridge. It sinks down due to density. The Earth’s ocean floors move like conveyor belts, carrying the continents along with them, as they move.

Where does molten rise and erupt?

Molten rock, i.e., magma, is less dense and more buoyant than the surrounding rock, as a result magma rises through Earth’s crust. Most magma is trapped in the crust, but some erupts onto the Earth’s surface as lava.

Where does the material involved in sea-floor spreading come from?

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.

Where does the material involved in seafloor spreading come from?

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.

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

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 happens to the rock along the ridge when new molten material erupts?

What happens to the rock along the ridge when new molten material erupts? The older rock moves outward on both sides of the ridge as new rock forms in the center of the ridge from cooling of molten material. This process is sea floor spreading.

Why does partly molten material rises toward Earth’s surface?

Some partly molten material rises to the surface because it is less dense than cooler denser magma that is underneath it and so it moves up. The ideas of Hess, Wegener and others emphasize that earth is a dynamic planet.

What molten material will come out from the ridge?

Beneath a typical mid-ocean ridge, mantle material partially melts as it rises in response to reduced pressure. This melted rock, or “magma”, may collect in a reservoir a few kilometers below the seafloor, awaiting eruption.

What happens to molten magma when it rises from the mantle?

, B.Lib(Hons) from Loughborough University (1984) Molten magma rises from the mantle at the places where the plates are moving apart. Immediatelypart of a plate moves away from its neighbour, molten magma immediately wells up from the mantle to filll the gap. It cools and hardens to form new crust.

What happens when a tectonic plate moves away from its neighbour?

Immediatelypart of a plate moves away from its neighbour, molten magma immediately wells up from the mantle to filll the gap. It cools and hardens to form new crust.

What type of plate is the East Pacific Rise?

The East Pacific Rise is another mid-oceanic ridge located along the floor of the Pacific. It separates the Pacific Plate to the west from (north to south) the North American Plate, the Rivera Plate, the Cocos Plate, the Nazca Plate and the Antarctic Plate.