How did the fleet system help make Havana a commercial hub in the 1700s? A. The gold trade in Cuba made Havana a destination for Europeans and colonists.

B. It was a reliable and regular trade system between Spain and the American colonies.

C. A growth in available ports made the city a known fishing and shipping destination.

D. The growing population could support and operate more commercial ships.

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.