Ricky ppt
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Earth's hot spots are locations where volcanoes form due to magma rising from deep within the Earth and erupting at the surface. Volcanoes produce lava flows, pyroclastic materials, and gases. There are different types of volcanoes including cinder cones, shield volcanoes, composite volcanoes, and lava domes which vary in shape and composition. Volcanoes pose dangers through gases, tremors, and eruptions.
Ricky ppt
- 1. Earth’s Hot Spots Volcanoes
- 2. A naturally occurring processMagma rises to the surface At the surface, Lava and/or Pyroclastic FlowWhat is Volcanism?
- 3. Volcanic GasesLava FlowsPyroclastic Materials CompContents of a Volcano
- 4. Cinder ConesSmall, steep-sidedPyroclastic materialShield VolcanoDome-shapedBuilt up from lava flowTypes of Volcanoes
- 6. Dangerous gasesVolcanic TremorsForecasting volcanoes?Dangers of Volcanoes
- 8. Circum-Pacific beltMediterranean belt Cascade range
Editor's Notes
- #4: Volcanic Gases:-present day: 50%-80% water vapor< amounts of CO2, Nitrogen, Sulfur gases.Lava Flows:-Panahoe-taffy-like flow-AA- rough, angular block and fragments-Pillow Lava-bubble-like mass, formed when lava chills rapidly.Pyroclastic Materials:-volcanic ash-very toxic
- #5: Cinder Cones-rarelyexcede 400 m high-made from the toxic pyroclastic materialShield Volcanoes-built from the overlapping mineral lava flows
- #6: Composite-composed of lava flows and pyroclastic layers-typically mudflows
- #7: Gas:-very toxic, CO2Volcanic Tremors:-ground motion that last for days to months, causing magma to move beneath the surfaceForecast?-Some larger, more dangerous volcanoes are monitered-United States Geological Survey(USGS) have found several ways to help with the planning of volcanoes.