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Science Test Review

Chapter 3

What do geysers do? They erupt hot steam and water.
How do calderas form? After an eruption, the volcanic mountain collapses.
What impact does silica have on magma? The amount of silica determines the thickness of the magma.
What and where is the Ring of Fire? It is a major belt of volcanoes surrounding the Pacific Ocean.
What is magma? It is hot molten rock beneath the surface.
What descriptions refers to a pyroclastic flow? It is explosive and consists of ash, cinders, and bombs.
What is a volcano? It is a weak spot in the crust where magma come out from.
How does a volcanic neck form? It forms when hardened magma inside the pipe never erupts and the surrounding volcano weathers away.
What makes volcanic soil so fertile? It is full with nutrients, minerals, and rich in potassium and phosphorus.
How does a lava plateau form? It forms when thin, runny lava escapes through long, narrow openings.
What are the 3 volcanic types and how do they form? 1. Shield-repeated lava flows during quiet eruptions gradually build up a broad, gently sloping volcanic mountain. 2. Cinder Cone-when cinders erupt explosively from a volcanic vent, they pile around the vent, forming a cone-shaped hill.
3. Layers of lava alternate with layers of ash, cinders, and bombs. Has both quiet and explosive eruptions.
What makes a volcano active or dormant. A volcano is active when it could erupt at anytime. When the volcano is dormant, it is not expected to erupt anytime soon.
Why does magma rise through the crust? Because it's less dense that surrounding solid rock.
Pahoehoe and aa come from what kind of eruptions? They both come from quiet eruptions.
What is inside a magma chamber? Inside is magma.
What is geothermal energy and how is it used? Magma heats groundwater and it is used for home heating and electricity.
How does a batholith form? Giant slabs of hardened magma inside the crust lie horizontally.
What are the 3 factors for the thickness of magma? Silica content, gas content, and temperature.
Where is a hot spot? Away from a boundary near the middle of a plate.
Created by: ilievam969