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
Cinder Cones-rarelyexcede 400 m high-made from the toxic pyroclastic materialShield Volcanoes-built from the overlapping mineral lava flows
Composite-composed of lava flows and pyroclastic layers-typically mudflows
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.
Earth’s Hot Spots <br />Volcanoes<br />
A naturally occurring process<br />Magma rises to the surface <br />At the surface, Lava and/or Pyroclastic Flow<br />What is Volcanism?<br />
Volcanic Gases<br />Lava Flows<br />Pyroclastic Materials <br />Comp<br />Contents of a Volcano<br />
Cinder Cones<br />Small, steep-sided<br />Pyroclastic material<br />Shield Volcano<br />Dome-shaped<br />Built up from lava flow<br />Types of Volcanoes<br />Fig. 5.9,b<br />Fig. 5.10<br />