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Transcript of Volcano Webquest
Images from Shutterstock.com Volcano Pictures!! VOLCANIC HAZARDS
This is a lava flow. VOLCANO WEBQUEST! BY HOLLY CABLE Types of Volcanoes Volcano Types Cinder Cones Composite Shield Volcanoes Mauna Loa Volcano Sunset Crater Volcano Paricutin Volcano Mt. St. Helens Shishaldin Volcano Volcanic Features Volcanic Plugs-
These form when lava solidifies in the pipe of an extinct volcano. Later the outside of the volcano will wear away, leaving behind the plug. Lava Plateaus-
When large outpourings of fluid lava occurs, a lava plateau forms. The lava forms in layers on top of each other, creating the plateau. Geysers- Geysers form when water seeps into cracks in rocks, and then drains to a cave-like chamber. The heat of the rocks transforms the water to steam. As more steam gathers, the more pressure is put on the rock. When there is too much pressure, water and steam shoot into the air after reaching the surface. Volcanic Hazards! Lava Flows can damage property,
but rarely endanger lives. Volcanic Gases-
these gases generally don't harm healthy people, but can affect people with asthma.Gases can mix with water and create acid rain. Don't be downwind from active vents that emit gases! HEY!!!!! Airborne Lava Fragments are called "tephra". They are usually ejected by lava fountains, and only pose a serious hazard in the immediate vicinity of an erupting vent Bibliography:
http://kids.nationalgeographic.com/kids/photos/gallery/volcanoes Volcano Facts! There are about 500
active volcanoes in
today. The ancient Romans believed volcanoes erupted because of wind imprisoned inside the Earth. The ancient Polynesians
believed that eruptions
occurred when their
Goddess of Volcanoes
was angered. Scientists estimate that
200,000 people have died
from eruptions in the past
500 years. Deadly
Vesuvius! Nearly 3 million people
live next to Vesuvius in Italy. Still active today. Pyroclastic flows
ripped through 3
towns before entering the Bay
of Naples. Destroyed and buried
ash. Most dangerous volcano in Europe. Instruments Used for Prediction Magma rises, moderate earth tremors form.
The higher magma rises, the more intense tremors.
Seismographic Monitoring watches over the tremors to alert people if an eruption is approaching. Tiltmeters Seimographic
Monitoring!! Rising magma causes ground deformation that is measured by tiltmeters. Would YOU like to be a volcanologist? NO!!!!!!!!!
1) It doesn't involve animals.
2) I would have to take, like, 5 math classes a year.
3) I wouldn't like all the hiking they do, and I guess I would be kinda nervous about being next to an active volcano! Describing the
Mt. St. Helens Eruption! Mushroom ash
rose into the
of rocks and grit
tumbled down. Pumice poured
from the crater. The landscape
changed. "Magma" comes from an Italian word that means thick pasty substance."Lava" means to slide.
Magma is thick,
and when it comes out of the
volcano, it slides.
That's where we get the word lava. Why is magma called "lava" after it erupts?