2. VOLCANISM
•Is the phenomenon of eruption of
molten rock (magma) onto the
surface of the earth or a solid
surface planet or moon, where
lava, pyroclastics and volcanic
gases erupt through a break in the
surface called a vent.
3. VOLCANIC PROCESSESS
•Magma
▫ From the mantle or lower crust rises
through its crust to the surface.
▫ If the magma reaches the surface, its
behavior depends on the viscosity of
the molten constituent rock.
17. VOLCANOES
▫Are placed where magma
reaches the earth’s surface
▫The type of volcanoes depends
on the location of the eruption
and consistency of the magma
18. TYPE OF VOLCANOES
▫ Shield Cone
Has a low rounded
profile
Gentle slopes of 2-10
degrees
22. TYPE OF VOLCANOES
Cinder Cone
Pyroclastic Material (Fragmented
material that has been explosively
ejected)
Ash and debris accumulates
around the vent
Small steep sided cones
