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Unit G: Geologic Time

The Layered Earth: Unit G, Geologic Time. Lesson Key Concepts. G1: Age of the Earth. How do we determine the age of the Earth? Key Concepts: Evidence from geologic layers and radioactive dating indicates Earth is about 4.6 billion years old, and has supported life for more than 3.4 billion years. G2: Supercontinents, Plate Motion and the Modern World. What are the effects of plate motion on the Earth system? Key Concepts: The arrangement of continents and oceans has changed over time as a result of plate motion, and will continue to change. Geological evidence suggests that the continents, climate and life forms have changed over time. G3: Catastrophic Events. How have catastrophic events affected life on the Earth? Key Concepts: Catastrophic events can have a major impact on life on Earth.
G4: Earth's Future. What might the Earth look like in the future? Key Concepts: The arrangements of the continents will continue to change in the future. Tectonic plate motion will eventually cease and there will be no more earthquakes or volcanism. Ultimately Earth's land surface may have a uniform elevation due to continued erosion and mass wasting. Change over time occurs on the Earth and the solar system.