Across
- 4. V-shaped valleys that are the deepest parts of the oceans where subduction occurs.
Down
- 1. The process in which crust pushes downward into the mantle at a fault line.
- 2. A type of plate boundary where the plates slowly move apart from each other.
- 3. currents Circulatory patterns of heat in the magma believed to be the driving force behind plate movement.