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VOLCANS (ERUPTION PROCESS (eruption (increasing pressure, escaping gases),…
VOLCANS
ERUPTION PROCESS
upward migration of magma
magma accumulation
eruption
increasing pressure
escaping gases
formation of magma
TYPES OF VOLCANIC ACTIVITY
gas content
accumulation of gases
increases the explosiveness
the viscosity of the lava
more viscous lava- more explosive eruption
TYPES OF VOLCANO
shield
cone and wide base
stratovolcano
alternate layers of pyroclasts
caldera
large circular depression
cinder cone
small and steep sides
RELEASED MATERIAL
gases
water vapour
lava
melted material that flows
volcanic rock
solidification of lava
pyroclasts sizes:
ash
smaller 2mm
lapilli
between 2-64mm
blocks and bombs
larger 64mm
PARTS OF THE VOLCANO
crater
upper opening
magma chamber
reservoir
central vent
connects magma and crater
volcanic cone
structure