they are volcanos.
rocks lava magma
they are called volcanoes
Mountains made of rock are simply called mountains.
Solidified lava, sulphur, volcanic ash.
the lava came from mountains
Three different types of volcanoes are: 1) Shield volcanoes; they are large mountains with gentle slopes. 2) Cinder cones volcanoes; they are small volcanoes made of hardened lava chunks called cinders. 3) Composite volcanoes; they are medium sized mountains made up of layers of lava that alternates with cinders.
shield volcanoes
Lava creates islands, minerals, rock formations (igneous), and builds onto the volcano.
Adirondack mountains
Lava
lava formed the volcanic mountains