Download Force of Volcanoes

Force of Volcanoes
Odysseyware Guided Notes
Vocabulary
_________________ _______ magma that is a mix of basaltic and rhyolitic; eruption may or may not be explosive
________________________ magma that has low viscosity and low silica and gas content; eruption is non-explosive
________________________ volcano formed of volcanic rock and ash; erodes quickly
________________________ volcano that is tall and steep; formed of lava and volcanic debris
_______________________ non-explosive or very mild volcanic eruption
_______________________ an active area of volcanoes due to a consistent source of magma in the asthenosphere
_______________________ the most powerful, explosive type of volcanic eruption
_______________________ volcanic flow that contains a high concentration of gases, ash, and small rocks
_______________________ magma that has a high viscosity and high silica and gas content; eruption tends to be very
explosive
______________________ volcano that has tall, broad slopes; formed by repeated, gradual lava flows
_____________________ an intermittent explosive volcanic eruption
______________________ ability of a substance to resist flowing
What is a Volcano?
Force that creates volcanoes
_________________ plates are constantly colliding, grinding, and pulling. Each of these interactions causes tremendous
_____________, ________________, and ________________ in the asthenosphere.
Sometimes, heat and pressure cause rock in the plates to change into metamorphic rock or melt into ___________ in the
asthenosphere.
Types of Magma (video)
Types of Eruptions and Volcanoes (video)
______________ volcanoes form from long, gradual lava flows, pouring out in all directions.
The ___________ ______________ are short and built from these ejected materials, mainly ash and rocks that fall near
the summit or crate of the volcano.
___________________ magma is a mixture of basaltic and rhyolitic magma, therefore, it may or may not be explosive,
but cinder cones always come from _____________ eruptions.
The third type of volcanoes are _____________ volcanoes, also known as stratovolcanoes. They usually produce very
violent eruptions, called plinian or vulcanian eruptions. They are large and have _____________ sides formed by
alternating layers of lava, ash, and rock.
Where do volcanoes occur?
On the north side of the _____________ ____ _______________, the _____________ plate subducts under the North
American plate.