Maddie

1. a fault zone where two plates slide past eachother horizontally
2. the formation of new areas oceanic crusts, which occurs through the upwelling of magma at midocean ridges and its outward movement on either side.
4. the gradual movement of the continents across the earth's surface through geological time
5. 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
6. a supercontinent that included all of the world's landmasses
7. an actively deforming region where two or more tectonics places move toward each other and collide
10. a 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 geographic north
11. 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
12. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
13. a line on a map or diagram connecting points relating to the same time or equal times.

1. the lithosphere of the earth is divided into a small number of plates which float on and travel independent over the mantle and much of the earth's seismic activity occurs at the boundaries of these plates
3. a proposed mechanism for plate motion in plate tectonics
8. a linear feature between two tectonic plates that are moving away from each other
9. the portion of motion of a tectonic plate that can be accounted for by its subduction
10. an instrument used for measuring magnetic forces, especially the earth's magnetism