What causes exchange rates to change?

Any change in imports or exports will certainly cause a change in the rate of exchange.

Explanation:

If imports exceed exports, the demand for foreign currency rises; hence the rate of exchange moves against the country.

the hyksos invasion. the hyksos were able to attack egypt successfully because of their skills in using bronze weapons, composite bows and the use of the horse and chariot during the invasion. although the egyptians depict a barbarian-type overthrow, the truth is the seizure was likely a relatively peaceful one.