Geologic Time scale and Plate Tectonics Pretest

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Geologic Time Scale

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Timeline of major events and life forms on Earth over billions of years

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Geologic Time Scale divisions

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Highlight major changes in Earth's geology, climate, and life

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Ring of Fire: Tectonic Plate Boundaries

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High earthquake and volcanic activity

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Key characteristic of the Ring of Fire

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Circular region encircling the Pacific Ocean; high earthquake, volcanic, and tectonic activity

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Earthquakes and tectonic plates

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Caused by abrupt energy release from moving and colliding plates

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Consequences of earthquakes along the Ring of Fire

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Development of new mountain ranges and continents

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Largest earthquakes near tectonic plate boundaries

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Greatest stresses and strains lead to frequent seismic events

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Geologic Time Scale: Records of species appearance and extinction

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Helps understand Earth's life history

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Key reason for Geologic Time Scale divisions

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Distinguish gradual changes in Earth's geology, climate, and life forms

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Plate tectonics & volcanic activity in the Ring of Fire

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High stresses from plate collisions & subduction zones cause earthquakes