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shield volcanoes have gentle sides and aren't very tall
It depends on viscosity of the lava. the runnier the lava, the farther it flows before solidifying, so it cannot pile up as fast.
The three major types of volcanoes are shield volcanoes, cinder cone volcanoes, and stratovolcanoes. Shield volcanoes have broad, gently sloping sides and are primarily composed of basaltic lava. Cinder cone volcanoes are small, steep-sided volcanoes that erupt primarily cinder-sized fragments. Stratovolcanoes are tall, conical volcanoes composed of alternating layers of lava flows, volcanic ash, and other materials.
No, shield volcanoes are not steep mountains. They have gently sloping sides due to the relatively low viscosity of the lava that flows from them, which allows the lava to spread out and create a wide, shield-like shape.
These volcanoes are called stratovolcanoes or composite volcanoes. They are characterized by their steep slopes and alternating layers of cinders, ash, and lava flows, typically made of basaltic and andesitic compositions.