Explain how new crust is formed at construction plate boundary.
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At constructive plate margins , mid-ocean ridges will be formed. As the plates move apart (very slowly), magma rises from the mantle. The magma erupts to the surface of the Earth. ... When the magma reaches the surface, it cools and solidifies to form a new crust of igneous rock .
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A constructive plate boundary, sometimes called a divergent plate margin, occurs when plates move apart. Volcanoes are formed as magma wells up to fill the gap, and eventually new crust is formed. An example of a constructive plate boundary is the mid-Atlantic Ridge.
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