Whats the summary of ghost map by steven johnson?

a characteristic is a deep cut in the earth or left over rock aka till.  

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.

identify consequences of international trade.

identify consequences of international trade.