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Review: Vocabulary Earth Structure

Across
Dating a sample by comparing its position to another sample's position
Low frequency waves that cause earthquakes
Floating
Historic Single landmass of Earth
Device that measures depth by bouncing high frequency sound waves off ocean floor
Process of determining the age of rocks using radioactive elelments
Original theory: movement of continents
Earth's cool, rigid outer layer
Down
The process by which heat is transfered directly through matter
Movement of seafloor in opposite directions
Heated, less dense material moves upward
Current theory of continental movment
Areas of seafloor where the crust dives under another piece of crust
Hot partially melted, slowly flowing layer of upper mantel
Layer beneath the crust