Magma reaches the surface of the earth by erupting through a volcano, which is

Answer : a mountain or a hill that is being created on the Earth's crust when magma lands on the surface. 

A volcano is also referred to as the vent that facilitates the transport of molten rock from deepest part of the Earth towards the its surface. The magma or the molten rock that erupts from the volcano is called lava. Lava is responsible for the construction of the cone that surrounds the vent of the volcano. A volcano that erupts magma turned to lava is called and active volcano while the volcano that has not erupted for quite some time is called dormant volcano.

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