GEOLOGY

Detailed explanation-1: -That’s because the viscous volcanic material doesn’t flow that far from where it is erupted, so it builds up in layers forming a cone-shaped volcano known as a stratovolcano.

Detailed explanation-2: -Composite cones are large volcanoes (many thousands of feet or meters tall) generally composed of lava flows, pyroclastic deposits, and mudflow (lahar) deposits, as well as lava domes. Composite volcanoes are active over long periods (tens to hundreds of thousands of years), and erupt periodically.

Detailed explanation-3: -Cinder Cones (Fig. 5.12) are built from pyroclastic debris that accumulates around the vent of an explosive volcano.

Detailed explanation-4: -A quiet eruption of low-viscosity lava produces a wide, flat volcano called a shield volcano.