102-104 114-119

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Pictures:

Basalt.jpg
Basalt

Granite.jpg
Granite

Feldspar.jpg
Feldspar

Obsidian1.jpg
Obsidian

floating_pumice_big.jpg
Pumice

scoria500.jpg
Scoria

basalt_massive.jpg
Aphanitic Basalt



Notes 134-140

- Pyroclastic Materials are the particles produced in both of these situations,
such as when vicsious magmas are charged with gases.
- The Anatomy of a Volcano, a volcano involves a conduit, also known as the pipe, and the vent.
- The funnel-shaped depression is known as the crater.
- A crater is the part where the volcano ejects magma out of.
- Sield volcanoes are produced by the accumulation of fluid basaltic lavas.
- Earth's most picturesque yet potentially dangerous volcanoes are composite cones or stratovolcanoes.
- The classis conposite cone is a large nearly symmetrical structure composed of both lava and pyroclastic deposits.
- Just as shield volcanoes owe their shape to fluis basaltic lavas, composite cones reflect the nature of the erupted material.


Notes 124-134
-Volatiles are the gaseous components of magma, mainly the water.
-Magmas may produce explosive clouds of hot ash and gases that evolve into bouyant plumes called
eruption columns that extend thousands of meters into the atmosphere.
-When vicious magma goes off, the developing gas bubbles do not easily escape but rather cause the molten material to expand resulting in a gradual increase in the internal pressure.
-A crater is the part where the volcano ejects magma out of.
-Most explosive eruptions are followed by the quiet emission of "degassed" lavas.
-The dangers of magma, plus the quantity od dissolved gases and the ease with which they can escape,
determines to a lrge extent the nature of a volcanis erruption.