PLATE TECTONICS THEORY (2)

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7 Terms

1
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astenosphere

  • a ductile layer under the lithosphere composed of partly molten rocks due to high temperature and pressure

2
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mid-ocean ridges

  • long, underwater mountain range, typically found in the middle of an ocean

3
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trenches

  • long anrrow excavations or depression in the ground

4
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mountain ranges

  • series or chains of mountains closely connected by high ground

5
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countries with most frequent occurrences

  • indonesia

  • new zealand

  • papua new guinea

  • japan

  • united states

  • philippines

  • canada

  • chile

  • guatemala

  • russia

  • peru

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the pacific ring of fire

  • home to 75% of the world's active volcanoes

  • experiences approximately 90% of the world's earthquakes

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volcanic activities in the ph

  • 300 volcanoes, 24 active

  • erupts 7-10 years

  • over the past 400 yrs, 44 significant eruptions occurred