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Ch. 12 Volcano Test
Chapter 12 Volcano Test
Question | Answer |
---|---|
A volcano is an opening in Earth that erupts... | Gases, Lava, and Ash |
A pyroclastic flow is... | hot volcanic ash and debris that rushes down the side of the volcano |
Sulfurous gases emitted by volcanoes | can mix with water vapor and form acid rain |
What causes magma to rise to the surface? | Magma is less dense than rock |
What is the difference between magma and lava? | After magma reaches the surface it's called lava |
What is a vent? | The opening in a volcano |
Magma originates in which layer of the earth | Mantle |
Volcanoes are found in areas where Earth | Plates collide |
The Hawaiian Islands are formed because of | Hot Spots |
What two factors control the explosiveness of an eruptions? | The amount of water vapor and silica present in the magma |
Shield volcanoes are the result of | basaltic lava flows |
Cinder cone volcanic eruptions are | explosive and throw lava high into the air |
Composite volcanoes are found mostly where | earths plates come together and one plate sinks beneath another |
Granitic magma eruptions are | explosive |
Of the three types of volcanoes, which ones are the least explosive | Shield |
Intrusive igneous rocks are those which | Cool inside the earth |
What are batholiths? | magma bodies that cool slowly before they reach the surface of the earth |
What is the difference between a dike and a sill? | dikes are formed across vertical cracks and sills are formed across horizontal ones |
Calderas form | after an eruption |
Intrusive igneous rock bodies such as batholiths and sills from when | magma solidifies underground |
What are batholiths? | magma bodies that cool slowly before they reach the surface of the earth |
A volcanic neck is the remains of a/an | eroded volcano |