Across
- 2. was a supercontinent that existed during the late Paleozoic and early Mesozoic eras.
- 7. a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.
- 9. is a fault zone where two plates slide past each other horizontally.
- 10. is the theory that the outer rigid layer of the earth (the lithosphere) is divided into a couple of dozen "plates" that move around across the earth's surface relative to each other, like slabs of ice on a lake.
- 11. the branch of geophysics concerned with the magnetism in rocks that was induced by the earth's magnetic field at the time of their formation.
- 12. is a linear feature that exists between two tectonic plates that are moving away from each other.
- 14. Changes in direction or orientation of the magnetic field of the Earth that have occurred from time to time.
Down
- 1. measurement instruments used for two general purposes: to measure the magnetization of a magnetic material like a ferromagnet, or to measure the strength and, in some cases, the direction of the magnetic field at a point in space.
- 3. a 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.
- 4. a proposed mechanism for plate motion in plate tectonics.
- 5. is the portion of motion of a tectonic plate that can be accounted for by its subduction.
- 6. an actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide.
- 8. the movement of the Earth's continents relative to each other.
- 13. a line on a diagram or map connecting points relating to the same time or equal times.
- 15. is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge.