Alex Janssen
Across
- 2. proposed mechanism for plate motion in plate tectonics
- 4. the portion of motion of a tectonic plate that can be accounted for by its subduction
- 5. a feature that exists between two tectonic plates that are moving away from each other
- 7. the lithosphere of the earth is divided into a small number of plates which float on and travel independently over the mantle and much of the earth's seismic activity occurs at the boundaries of these plates
- 10. hypothetical landmass that existed when all continents were joined, from about 300 to 200 million years ago
- 11. instrument used for measuring magnetic forces, especially the earth's magnetism
- 12. Changes in direction or orientation of the magnetic field of the Earth that have occurred from time to time
- 13. sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
- 14. line on a diagram or map connecting points relating to the same time or equal times
Down
- 1. actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide
- 3. large elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly parallel faults or fault systems
- 6. study of the magnetic record in rocks
- 7. strike-slip fault that offsets a mid-ocean ridge in opposing directions on either side of an axis of seafloor spreading
- 8. gradual movement of the continents across the earth's surface through geological time
- 9. process of the ocean floor moving away from an ocean ridge