SCIENCE

123456
Across
  1. 3. formulated the Seafloor Spreading Theory
  2. 5. occurs when two tectonic plates move away from each other
  3. 6. is the most destructive type of seismic surface wave
Down
  1. 1. the third layer of the Earth
  2. 2. thinnest and outermost layer of the Earth
  3. 4. is a lowland region that forms where Earth's tectonic plates move apart, or rift