6. Volcano
•–is an opening in
the Earth’s surface
where molten rocks,
smoke, gases, and
ashes are erupted.
7. Classification of Volcanoes
•Active volcanoes - are
those that have a record of
eruption with the last 600
years of those that erupted
10, 000 years ago based on
analyses of their its
materials.
8. Inactive volcanoes – are
those that have not erupted
for the last 10, 000 years ago
and their physical form is
being changed by agents of
weathering and erosion
through formation of deep
and long gullies.
9. Three general volcanic types
according to the shape of their
cones;
•Shield cones.
•Cinder cones
•Composite cones
21. Viscosity
•– is the property of the material’s
resistance to flow. It also
described as the liquid’s thickness
and stickiness. The, more viscous
and thicker the material is the
greater is its resistance to flow.
For instance, syrup is more
viscous than water
22. Primary factors affecting the
magma’s viscosity in different ways.
•Temperature of magma
affects its viscosity.
•The composition of magma
affects its viscosity.
•The amount of gases
contained in the magma
affects its viscosity.
23.
24. Types of volcanic eruptions
•Phreatic or hydrothermal
•Phreatomagmatic
•Stromboli an
•Vulcanian
•Pinian
25. Energy from the volcano
Mak-Ban Geothermal Power Plant in
Laguna
26. Geothermal
•It is a source of
energy that comes
from a heat in the
Earth’s interior.
27. It is generated in two ways:
•Geothermal power
plants
•Geothermal heat
pumps
