Across
- 2. The mineralized remains of organisms, showing how long-dead organisms lived and how their bodies were structured.
- 3. Currents, A cyclical motion occurs because of density differences in the mantle. Heated, less dense lower regions of the fluid mantle rise, and denser, cooler regions sink due to gravity. The combined motions serve as the engine for crustal plate movement.
- 6. Boundary, The boundary between two plates that slide past one another.
- 8. The process in which a denser plate is pushed downward beneath a less dense plate when plates converge.
- 10. Boundary, The boundary between two tectonic plates moving toward each other.
- 11. Outermost layer of Earth that is divided into enormous pieces called tectonic plates; consists of the crust and the rigid uppermost part of the mantle.
Down
- 1. The solid layer with plasticity in the upper mantle that is located just below the lithosphere; lithospheric plates “float” and move on this layer.
- 4. Boundary, Occurs when two tectonic plates move away from each other.
- 5. Drift, The theory that continents were once connected but have drifted apart.
- 7. Striping, A parallel pattern of rock material found at identical locations on each side of the Mid-Atlantic Ridge reveals rock of the same geologic age and polarity.
- 9. Trench, Deep and narrow depressions in the seafloor where the subducted plate moves into the asthenosphere.