plate tectonics
Across
- 2. outermost layer of earth’s surface
- 4. a volcano that scientists believe will not erupt again
- 5. a hole in the earth from which molten rock, gases and ash erupt
- 7. thickest layer of earth
Down
- 1. plate boundary where plates move away from each other
- 3. plate boundary where plates slide past each other
- 6. plate boundary where plates move towards each other