VOLCANIC HAZARDS

LAVA FLOWS

Lava is molten rock that flows out of a volcano or volcanic vent.

Fluid flows

Hotter and move the fastest

They can form stream or spread out across the landscape in lobes

Viscous flows

Cooler and travel shorter distances

Can sometimes build up into lava domes can form pyroclastic density currents

Extremely hot - between 1,000-2,000 °C (1,800-3,600°F)

Often burn down vegetation and structures.It can also crush or bury whatever survives being burned.

PYROCLASTIC DENSITY CURRENTS

-Move at speeds of up to 1,000 kph (650 mph)

-They are extremely hot up to 400 °C(750 °F)

Destroy anything in their path,either by burning or crushing or both by debris

PYROCLASTIC FALLS

LAHARS

A specific kind of mudflow made up of volcanic debris

Can travel at speeds of over 80 kph (50 mph) and they may retain enough heat to still be 60-70 °C.

They will either bulldoze or bury anything in their path

GASES

Sulfur dioxide (SO2) and hydrogen sulfide (H2S) are both sulfur-based gases

Both acids irritate soft tissues such as eyes,nose,throat and lungs

Burns and attacks calcium in the skeletal system.

Pyroclastic material may actually block sunlight and cause temporary cooling of the earth's surface,

It is heavier than air and can suffocate people and animals.

Known as volcanic fallout,occur when tephra -fragmented rock ranging in size from mm to tens of cm (fractions of inches to feet)

They are mixtures of pulverized rock,ash and hot gases, and can move at speeds of hundreds of miles per hour

Contain toxic chemicals which can be dangerous for both people and livestock.

Destroy moving parts in motors and engines(especially in aircraft) and scratch surfaces