Across
- 2. __________ spreading center under the ocean where ridge push occurs.
- 4. ___________ pulling force exerted by a cold oceanic plate plunging into the mantle due to density, weight and gravity.
- 7. ___________ Drift - theiry that all continents were once joined as one continent.
- 8. ____________ mechanical layer of the earth that is made up of the crust and the cooler upper mantle.
- 9. __________ atoms of the same element that have different atomic weights.
Down
- 1. _______________ Navy scientist who suggested theory of seafloor spreading.
- 3. ___________Time Scale - time units based on fossils contained in the rocks.
- 5. ______________ process of heat transfer in the Earths mantle. One process that drives Plate Tectonics.
- 6. _____________ time it takes for half of a radioactive parent atom to decay into a stable daughter product.