The Portuguese, the Dutch, the English is the chronological order of European countries that controls the African slave trade. Slaves were used in mining and plantations. Five times as many Africans arrived in the Americas than in Europeans, as the result of this slave trade.
Explanation:
If a boat is gradually lowered into water it will gradually displace more and more water. As it displaces more water, the upthrust increases. ... The hydrometer, when placed in a liquid, will always sink until the weight of the liquid displaced is equal to the weight of the hydrometer
