Tim's Crossword

4. portion of motion of a tectonic plate that can be accounted for by its subduction
6. are places where plates slide sideways past each other
7. is an actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide.
11. was a supercontinent that existed during the late Paleozoic and early Mesozoic eras
12. 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
13. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate

1. the gradual movement of the continents across the earth's surface through geological time
2. change in the Earth's magnetic field resulting in the magnetic north being aligned with the geographic south, and the magnetic south being aligned with the geographic north
3. a line on a diagram or map connecting points relating to the same time or equal times
4. the formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side
5. proposed mechanism for plate motion in plate tectonics
6. 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
8. a linear feature that exists between two tectonic plates that are moving away from each other
9. measures small changes in magnetic fields
10. 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