Volcanoes and Plate Tectonics Flashcards
Magma’s viscosity depends on…
Amount of silica and temperature
Element
A substance that cannot be broken down into other substances
Physical
Still has same molecules
Chemical:
Different changes, changes what it actually is and can’t change it back
The greater the viscosity, the ______ a liquid flows. The _____ the viscosity, the more easily a liquid flows.
Slower, lower
Low silica magma forms rocks like ______.
Basalt
Pahoehoe
Hot, fast moving lava
Aa
Cool slow moving lava
Compound
A substance made of two or more elements that have chemically combined
Magma forms in the _____________.
Asthenosphere
Volcanic ash
Fine rocky particles as small as a speck of dust
Cinders
Pebble sized particles
Bombs
Particles ranging from the size of a baseball to the size of a car
Pyroclastic flow
Occurs when an explosive eruption hurls out a mixture of hot gases, ash, cinders, and bombs
Shield volcano
Gently sloping mountain formed by repeated lava flows
Lava plateau
High, level area formed by repeated lava flows
When volcanic ash breaks down, it releases _________ and __________, both of which are needed by plants
Potassium, phosphorus
Batholiths
A mass of rock formed when a large body of magma cools inside the crust
Geyser
A fountain of water and steam that erupts from the ground
Hot springs
When ground water heated by a nearby body of magma rises to the surface and collects in a natural pool
