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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.