The type of magma that may be unable to form a volcano is tephra magma.
What is a volcano?
A volcano is a crack in the earth's crust that allows lava, volcanic ash, and gases to escape.
Which magma can form volcanos?
Basaltic magma forms shield volcanoes, which are often found above a mantle plume, whereas andesitic/rhyolitic magma forms stratovolcanoes.
What is tephra?
All fragments of rock thrown into the atmosphere by an erupting volcano are tephra.
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