Mackenzy Funderberg

2. a valley with steep sides formed by movements of the Earth's surface
3. the gradual movement of the continents across the earth's surface
4. the study of the magnetic record in rocks
5. occurs as the weight of the subducting plate pulls into a subduction zone
10. is a boundary where two tectonic plates are moving away from one another
12. device that can detect small changes in magnetic fields
13. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
14. Changes in direction or orientation of the magnetic field of the Earth that have occurred from time to time
15. this process of the ocean floor moving away from an ocean ridge

1. the lithosphere of the earth is divided into a small number of plates which float on and travel independently over the mantle
6. A tectonic boundary where two plates are moving away from each other and new crust is forming from magma that rises to the Earth's surface between the two plates
7. the ancient supercontinent, comprising all the present continents joined together, which began to break up about 200 million years ago
8. As two plates slide past one another, in a transform boundary, neither plate is added to at the boundary, nor destroyed
9. type of line connects points on a map that have the same age
11. occurs when the elevation of a ridge pushes a plate near a subduction zone