DRR-LESSON 5

• The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) is the government agency responsible for monitoring weather conditions.
• VOLCANO - is an opening on the surface of a planet or moon that allows material warmer than its surroundings to escape from its interior
• hephaestus - greek mythology
• vulcan - roman mtyhology
• active volcanoes - have a recent history of eruptions, they are likely to erupt again
• phreatomagmatic eruptions - are volcanic eruptions resulting from interaction between magma and water
• dormant volcanoes - have not erupted for a very long time but may erupt at a future time
• extinct volcanoes - are not expected to erupt in the future
• volcanic eruption - when a lava and gas are released from a volcano
• subduction zones - plate tectonic boundaries where two plates convrge
• cinder cones - are circular or oval cones made up of small fragments of lava from a single vent that have been blown up. ex. pricutin(west central mexico)
• shield volcano - is a wide volcano with shallowly-sloping sides shiel volcanoes are formed by lava flows of low viscosity ex.(mauna loa the worlds biggest volcano in hawaii)
• caldera - is a large depression formed when a volcano erupts and collapses
• the ring of fir also referred to as the circum-pacific belt characterized by active volcanoes and frequent earthquakes
• lahar - process wherein wet cement-like mixture of volcanic material and water flows down the slopes of a volcano
• pyroclastic flow - chaotic mixture of rock fragments, gas, ash that travels rapidly away from a volcanic vent or collapsing flow front
• lava flows - streams of molten rock that pour or ooze from an erupting vent
• volcanic gases - gases given off by active volcanoes
• tephra - is general name given to anything thrown the air during a volcanic eruption. comes form the ancient greek means ashes