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Volcanoes erupt where one plate is pushed
The hole that is formed when the chamber
under the volcano is emptied and the volcano
Underground magma formations
(Formed when magma hardens in vertical or nearly
(Formed when magma hardens in horizontal layers of
(A dome shape formed when magma is pushed into a sill
and doesn’t spread)
When a laccolith is formed it may push the layers of rock above it.
(Huge, irregular shape deep in the earth’s crust)
Types of volcanoes
Dormant Extinct volcanoes
(Currently erupting or
(Does not erupt
for some time)
1) Shield volcanoes
Built by thinner, fluid lava that spreads over a
(Broad base and gently sloping sides)
2) Cinder-cone volcanoes
Formed by thick lava that is thrown high up in the
air and fall as chunks or cinders.
(Form as cone shape with narrow base and steep sides)
3) Composite volcanoes
Built by layers of ash and cinders sandwiched
between layers of hardened lava.
(Both sides of a composite volcano look the same)