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Ch 1 sections 3&4
Question | Answer |
---|---|
Continental Drift | A theory that continents can drift apart from one another and have done so in the past. |
Pangea | An extremely large landmass when all continents were connected together |
Fossil | The imprint or hardened remains of a plant or animal that lived long ago |
Deep-Ocean Trench | A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle. |
Mid-Ocean Ridge | Giant undersea mountain range extending around the world like the seams of a baseball. |
Sonar | A system that uses the reflection of underwater sound waves to detect objects. |
Seafloor Spreading | the idea that the middle of the ocean is spreading apart, moving very slowly in opposite directions. |
Subduction | Process in which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent boundary. |