No, 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 are characterized by their broad, gently sloping sides. They are formed by the accumulation of highly fluid basaltic lava flows that spread out over large areas. Famous examples include Mauna Loa in Hawaii.

* Cinder Cones: These are smaller, cone-shaped volcanoes built up from loose fragments of volcanic rock (cinders) ejected from a single vent. They have steep sides and are often characterized by a crater at the summit.

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