Question

which type of volcano is formed from andesitic magma high in dissolved gases?
composite cone
shield cone
fissures
cinder cone

Explanation:

Composite cones (also called stratovolcanoes) are formed from andesitic magma that has high dissolved gases. Andesitic magma has intermediate viscosity and gas content, leading to explosive eruptions that build up composite cones with alternating layers of ash, lava, and other materials. Shield cones are formed from basaltic magma (low gas, low viscosity), fissures are volcanic vents (not a volcano type), and cinder cones are formed from basaltic or andesitic magma but typically with less gas - rich andesitic magma compared to composite cones in terms of the typical association.

Answer:

A. composite cone