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Science Chapter 3

Study guide for Chapter 3 of Science

TermDefinition
Volcano Is a weak spot in the crust where molten material or magma comes to the surface
Magma Is a molten mixture
Lava After lava has cooled it forms solid rock
Ring of Fire Formed by many volcanoes that rim the Pacific Ocean
Island Arc The curve of it's echoes the curve of it's deep-ocean trench
Hot Spot is an area where magma from deep within the mantle melts through like a blowtorch
Magma Chamber beneath a volcano magma collects in a pocket
Pipe A long tube in the ground that magma moves through
Lava Flow is the area covered by lava as it pours out of a vent
Crater Is a bowl shaped area that may form at the top of a volcano around a volcano central vent
Silica Which is a material that is formed from the element oxygen and silicon is one of the most abundant materials in Earth's crust and mantle
Pahoehoe Is fast moving Lava
aa When aa hardens it forms a rough surface consisting of jagged lava chunks
Shield Volcano At some places on Earth's surface thin layers of lava pour out of a vent and harden on top of previous layers . Such lava flows gradually build a wide, gently sloping mountains
Cinder-Cone Volcanoes A steep cone shaped hill or mountain
Composite Volcanoes Are tall cone shaped mountain in which layers of lava alternate with layers of ash
Caldera The hole is filled with the pieces of the volcano that have fallen inward as well as some lava and ash
Volcanic Neck Forms when magma hardens in a volcano's pipe
Dike Magma that forces itself across rock layers hardens into a dike
Sill Magma squeezes between layers of rock it forms a sill
Batholith Is a mass of rock formed a large body of magma cools inside the crust
What is the Ring of Fire A volcanic belt
How does Plate Tectonics explain the volcanos that form along the mid-ocean ridge
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