"An estuary that is found within the mouth of a river where freshwater flows out to sea at the surface while seawater flows upstream along the bottom is ."

Salt wedge

Explanation:

"An estuary that is found within the mouth of a river where freshwater flows out to sea at the surface while seawater flows upstream along the bottom is a Salt wedge."

Salt-wedge estuaries take place when a rapidly moving river joins the ocean from the point of weak tidal currents. In such kind of salt estuary, the force of a river is responsible for pushing the water out to sea rather than upwards and is also a factor that determines the circular motion

the aksumite empire was an ancient kingdom located in what is now northern ethiopia from the period of 100 ad to 940 ad. its capital was the city of aksum. the kingdom established itself as one of the 4 great powers at its time, along with persia, rome, and china.

the kingdom was rich in goods like gold, iron, and salt. it established strong commercial ties with the regions governed by rome, egypt, and persia (arabia). aksum was a key location in this commercial network. trade was also facilitated with the introduction of the aksumite currency.

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