Describe the general relationships that exist among distance from the spreading centers, heat flow, age of the crustal rock, and ocean depth.

The spreading center is found at top the mid-oceanic ridges, and it is where two plates diverge from one another. The bottom of these ridges is the oceanic depth. The heat flow is the region where hot molten material travels upwards out of a subduction zone and causes seafloor spreading. The greater the size of the spreading center, the more the heat flow that will occur. Moreover, heat flow increases the thickness of the rock at the crust. 

Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. the winds blow from west to east in jet streams but the flow often shifts to the north and south. jet streams follow the boundaries between hot and cold air. the earth's rotation is responsible for the jet stream as well.