Increase trading between country’s or nearby towns
Crust mantle core should be right
The state of being scarce or in short supply; shortage.
Basically being low on a resource (lacking it)
An example would be if you were stuck in a desert, water would be scarce.
Because this happens in the pacific rim, where the most volcanoes and volcanic islands are found
Answer:
Dense water sinks below less dense water. This is the principle that drives the deep ocean currents that circulate around the world. A combination of high salinity and low temperature near the surface makes seawater dense enough to sink into the deep ocean and flow along the bottom of the basins.