Volcanoes and Plate Tectonics
Define Volcano
a weak spot in the crust where magma comes through
Define Magma (more than just lava underground)
The molten mixture of rock-forming substances, gases, and water deep in Earth's mantle
hot water and steam that erupts from the ground.
How are the three types of volcanoes formed?
Shield: made from harden layers of silica. thin layers of lava pour out of a vent and harden on previous layer.
Cinder: Lava explodes out of the volcano and then ash, cinders and bombs harden and layer up
Composite: lava flows alternate w/ explosions of ash, cinder and bombs
A substance that cannot be broken down into other substances is what?
An Element
A belt of volcanoes around the rim of the Pacific Ocean
The Ring of Fire
Where inside volcanoes does magma collect the most
What are the three stages a volcano can be in during it's lifetime. explain each
Extinct
Dormant
Active
When the top of a volcanic mountain collapses, what is formed?
Caldera
A substances ability to burn is an example of
What is Subduction?
What is the term we use for what's inside of magma/lava that controls it's viscosity
Silica
A ____________ happens when an explosive eruption hurls ash, cinders, bombs, and gases out of a volcano
pyroclastic flow
What forms when magma hardens in a volcano's pipe to later be exposed.
Volcanic Neck
a mass of rock that formed when a large body of magma cooled inside Earth's crust
POINT GAMBLE
Wager Points winner take all
Why does liquid magma flow upwards through the crust of the earth?
Because it's less dense than the solid material around it
Pahoehoe and Aa's are produced during what kind of explosion?
Quiet
Lava Plateau
Point Reverse
we are playing by golf rules now
An area where magma melts through the crust in the middle of a plate is called?
Hot Spot
How does a composite volcano differ from volcanos that have been formed in Hawaii (shield volcanos)
Composite is tall, cone-shaped, where layers of lava alternate w/ layer of ash.
Shield Volcanoes are wide and formed by thin layers of lava.
Why do plants grow around where there has been volcanic activity
Because the lava and magma release very good nutrients for the plants