Anwser=
Interlock
Hope it helps
I believe the answer is B
The earth has an area called the Ring of Fire because there is a 'ring' of volcanic activity created by border between the Pacific tectonic plate and 6 others.
Canals and inland waterways, natural or artificial waterways used for ... The lay of the land (topography) and particularly changes in water levels ... inland waterway transport is still more economical than any other kind of transport.
