Sea-floor spreading due to convection currents in the Earth's mantle (although this is still under investigation). Magma is pushed up through the cracks in the sea-floor as the plates move apart.
Basaltic magma rises through the mid ocean ridges.
Magma, from decompression melting of mantle rock, rises to the surface at divergent plate boundaries, such as the mid-ocean ridges.
Rising molten basaltic rock from the top of the mantle fills the crack at the midocean ridge and solidifies, preventing it from closing again.
lava that is what it is
Magma / lava.
seafloor spreading
The answer to that question is the following:=Magma rises toward the surface and solidifies=
It gets pushed out to either side of the mid-ocean ridge.
at the mid-ocean ridge, molten material rises up from the mantel and spreads out, pushing the older rocks to both sides of the ridge.
Plates at our planet's surface move because of the intense heat in the Earth's core that causes molten rock in the mantle layer to move. It moves in a pattern called a convection cell that forms when warm material rises, cools, and eventually sink down. As the cooled material sinks down, it is warmed and rises again.http://www.windows2universe.org/earth/interior/how_plates_move.html
Magma
Yes, when magma rises from an ocean ridge, it can produce new material through a process called seafloor spreading. As the magma reaches the surface, it cools and solidifies, forming new oceanic crust. This process contributes to the continuous expansion of the seafloor and the formation of new crustal material.
it is a REEF
When spreading molten material rises from the mantle in the sea-floor and erupts, it can create sea mounts, which are underwater mountains. If enough material is ejected, the mounts will break through the surface of the water to create islands.
The sea-floor spreading begins at the 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. At the same time, older rock moves outward on both sides of the ridge. As the molten material cools, it forms a strip of solid rock in the center of the ridge. When more molten material flows into the crack, it forms a new strip of rock.
Less/dence material rises
The sea-floor spreading begins at the 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. At the same time, older rock moves outward on both sides of the ridge. As the molten material cools, it forms a strip of solid rock in the center of the ridge. When more molten material flows into the crack, it forms a new strip of rock.
seafloor spreading
The Mid-Atlantic Ridge is found on the ocean floor in the middle of the Atlantic Ocean.
An underwater ridge that rises up close to the Earth's surface is called a seamount. Seamounts are underwater mountains formed by volcanic activity and can be found in oceans all around the world.
it is called the art of materilintasion which was discovered by the neanderthals
Cork consists of a material which is lighter, or less dense than water so it naturally rises to the surface.