GEOLOGY

Detailed explanation-1: -Explosive eruptions can form pyroclastic flows that sweep down valleys, destroying everything in their path. They also send ash high into the atmosphere, forming plumes.

Detailed explanation-2: -Explosive eruptions produce ash All explosive volcanic eruptions generate tephra, fragments of rock that are produced when magma or or rock is explosively ejected. The largest fragments, blocks and bombs (>64 mm, 2.5 inches diameter), can be expelled with great force but are deposited near the eruptive vent.

Detailed explanation-3: -During large explosive eruptions, wind disperses the finest rock particles (ash) and gases tens to hundreds of kilometers (miles) from an erupting vent and can result in heavy ash fall downwind.

Detailed explanation-4: -Volcanoes are composite hazards. There are both primary and secondary hazards which can be caused by volcanic eruptions. The primary hazards include pyroclastic flows, air-fall tephra, lava flows and volcanic gases.