plate
mason boldt
Continental Drift
https://docs.google.com/a/cbcsd.org/presentation/d/1YXCjcEi_LRUkmLncoRO0XklgDqOikc0nWtPRBKlfLLQ/edit I think it is valid because it did look like they fit together at one time.
Seafloor spreading
https://docs.google.com/a/cbcsd.org/presentation/d/1kqvldxUfb7AfSVpHs-P-IhnLa-oDNu6S99LqB1O2Wxw/edit I think it's valid because the old rocks are by the shore, and the new ones are in the middle of the ocean
plate techonics
https://docs.google.com/a/cbcsd.org/presentation/d/1qfDQGsZHpqah4d9-9hrLhwkeweuSRh1n-eBvUVUxk70/edit#slide=id.p I think it's valid because the structure of the earth's crust