GEOLOGY

Detailed explanation-1: -destructive boundaries (convergent): where plates are moving towards each other and old crust is either dragged down into the mantle at a subduction zone or pushed upwards to form mountain ranges.

Detailed explanation-2: -Composite volcanoes are the most common type of volcano and are common at destructive plate boundaries. The lava is viscous (thick) and has a higher silica level than with shield volcanoes. In a composite volcano the magma is too stiff to allow easy escape of volcanic gases.

Detailed explanation-3: -Destructive plate boundaries It usually involves an oceanic plate and a continental plate. This movement can cause earthquakes and volcanoes. An example of this plate boundary or margin is where the Nazca and South American plates are converging.

Detailed explanation-4: -Volcanoes are most common in these geologically active boundaries. The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries.

Detailed explanation-5: -Volcanoes are formed at destructive plate margins because as one plate subducts under the other, the lower plate is forced downward and the rock melts into magma. This magma can then rise and erupt out of a volcano. Destructive plate margins are the boundaries at which tectonic plates converge.