How are composites formed?

Answer 1

They are formed when an oceanic plate goes under another oceanic plate. Causing it to go under to the mantle. Which causes it to burn making the magma turn into lava. Once the lava hardens it then forms a Composite Volcano.
its fromed by putting your hand in the volcani and than seeing if the magma comes up and goes thrugh the vent. the volcano is a vent on the earth surface
A composite volcano is formed from eruptions of often viscous molten rock. Some eruptions are explosive, producing ash, pumice, and cinders. Other eruptions are effusive, producing lava domes and lava flows. This material gradually piles up in layers, forming a composite volcano.