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Magmatism
The formation of
igneous rocks
from
magma
is known as
magmatism
. Magmatism is a process responsible for mountain formation. The process of magmatism produces an additional mass and volume to the Earth’s surface. For example, the formation of
volcanoes
or
island arcs
at
convergent plate boundaries
or
mid-ocean ridges
and therefore
sea-floor spreading
at divergent plate boundaries.
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