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Volcanoes

QuestionAnswer
Composite Volcano 1. Rhyolite 2. High Viscosity 3. Felsic Magma 4. Explosive 5. Cone Shaped
Felsic 1. Silica Rich 2. Iron/Magnesium Poor 3. Thick Viscosity
High Viscosity 1. Thick 2. Stiff Flow 3. Loud
High Viscosity Examples 1. Tar 2. Honey 3. Glacial Ice 4. Felsic Magma 5. Rhyolite
How are magmas grouped? Based on the relative proportions of silica, iron, and magnesium.
How is magma erupted? 1. Lava Flows 2. Pyroclastic Materials
How many active volcanoes have a complete network of monitoring instruments? 20.
How many volcanoes are classified as active around the world? 1,500.
Lava Magma when it reaches the Earth's surface.
Low Viscosity 1. Thin 2. Fast Flowing 3. Quiet
Low Viscosity Examples 1. Water 2. Syrup 3. Mafic Magma 4. Basalt
Mafic 1. Poor Silica 2. Iron/Magnesium Rich 3. Thin Viscosity
Magma Molten rock below the Earth's surface.
Shield Volcano 1. Basalt 2. Low Viscosity 3. Mafic Magma 4. Peaceful 5. Flat
Temperature of Felsic Magma Somewhat hotter than 900 degrees Celsius.
Temperature of Mafic Magma Somewhat hotter than 1200 degrees Celsius.
Viscosity The resistance to flow.
What is the primary constitute of magma ? Silica; it is made of chains of silicon and oxygen atoms.
When does viscosity of magma increase? When there is an increase in silica and a decrease in temperature.
When/why do violent eruptions occur? When gases cannot escape easily.
Where are the world's most active volcanoes located? At sea level, along the convergent plate boundaries.
Where is the least common location of volcanoes? The interior of tectonic plates above hot spots.
Why do different plate boundaries produce different magma compositions? Because each setting generates magma from melting a different source rock.
Created by: Pel89
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