That's incorrect. A volcanic mountain with gently sloping sides built almost entirely out of basalt lava flows is called a shield volcano.

Here's why:

* Shield Volcanoes: These volcanoes are characterized by their broad, gently sloping sides. They are formed by the eruption of highly fluid, basaltic lava that spreads out over a wide area. Examples include Mauna Loa in Hawaii.

* Cinder Cones: These volcanoes are much smaller and have steep sides. They are formed by the accumulation of tephra (fragments of rock, ash, and volcanic bombs) ejected from a central vent. They tend to be short-lived and erupt explosively.

Let me know if you have any more questions about volcanoes!