5276910
Description
Question 1
Question
What is a Xenolith?
Answer
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fghjk
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A piece of rock within an igneous mass that is often derived from country rock.
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ghyjukilo
Question 2
Question
Complete the table on the properties of shield and strato volcanoes.
Answer
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Non-viscous
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Viscous
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Mafic
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Silicic
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Effusive
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Quiet eruptions as gas escapes easily
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Wide base (100s km)
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Central crater
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Shallow sides, 2-10 degrees
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Divergent
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Hotspots
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Little pyroclastics
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Explosive
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Violent eruptions as gas is held in lava
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Narrow base (10s km)
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Made of alternating layers of lava & ash
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Steeper sides, >30 degrees
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Convergent Cont-Oc
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Convergent Oc-Oc
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May have a caldera
Question 3
Question
List the stages of volcanic activity that form a caldera.
1) [blank_start]Violent[blank_end] eruption
2) Magma chamber partially [blank_start]emptied[blank_end]
3) Volcanic cone collapses into [blank_start]magma chamber[blank_end]
4) Remaining magma is [blank_start]compressed[blank_end] and erupted leaving a large [blank_start]depression[blank_end]
5) [blank_start]Rainwater[blank_end] collects to form a [blank_start]lake[blank_end]
Answer
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Violent
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emptied
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magma chamber
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compressed
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depression
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Rainwater
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lake
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