Across
- 3. formulated the Seafloor Spreading Theory
- 5. occurs when two tectonic plates move away from each other
- 6. is the most destructive type of seismic surface wave
Down
- 1. the third layer of the Earth
- 2. thinnest and outermost layer of the Earth
- 4. is a lowland region that forms where Earth's tectonic plates move apart, or rift