Kate's Crossword

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Across
  1. 3. two or more tectonic plates move toward each other and collide
  2. 5. A line or a curve on a geological map connecting points of identical age
Down
  1. 1. Proposed mechanism for plate motion in plate tectonics
  2. 2. The study of the magnetic record in rocks
  3. 3. The movement of earths continents relative to each other
  4. 4. A valley with steep sides; formed by a rift in the earths crust