The magma forming stratovolcanoes rises when water trapped both in hydrated minerals and in the porous basalt<span> rock of the upper oceanic crust is released into </span>mantle<span> rock of the </span>asthenosphere<span> above the sinking oceanic slab. The release of water from hydrated minerals is termed "dewatering", and occurs at specific pressures and temperatures for each mineral, as the plate descends to greater depths. The water freed from the rock lowers the </span>melting point<span> of the overlying mantle rock, which then undergoes partial melting and rises due to its lighter density relative to the surrounding mantle rock, and pools temporarily at the base of the </span>lithosphere<span>. </span>
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Explanation:
Explanation:
A spreading center is place on earth where the earth is pulling apart. Geologically, it is called a divergent margin.
In a divergent margin, two or more lithospheric plates are moving away from each other.
- Along such centers, the earth adds new materials to itself.
- This is usually in the form of new oceanic crust being created.
- At spreading centers new magma up-wells and forms on either side of the margin.
- A spreading center is usually called constructive margin.
Relationship between heat flow and distance from spreading center;
Heat flows away from spreading centers due to the hot temperature of the magmatic bodies around such places.
The mantle below is at a high temperature and convective cells keeps the heat being cycled. At a spreading center, the heat flows to the surface through escaping magma and away.
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Slowly under relatively deep conditions