The answer is A. Isthmus.
The First and Second Boer wars were a series of Conflicts between the Bristish Empire and the Afrikaners in South Africa. The prinicpal biligerants during on the Bristih End included The British Colonial Marines, as well as auxiliary forces from India, Austialia, Canada and New Zealand. On the Afrikaner side it was The South African Republic and the Free Orange States. The Outcome of the wars was a British victory with the signing of the Treaty of Vereeniging.
ancient Egyptians believed that the flood of the Nile was the tears of Isis, mourning the death of her husband Osiris, which is what is now called in Egypt “Wafaa el-Nile” [Loyalty of the Nile],
It is called plate techtonics
Steamboats. Steamboats positively effected the world because they made the transportation of goods more efficient and economical. Travel time was cut in half and were a compliment of the railroads, both for commercial and passenger transportation. Steamboats were independent on the wind speed and direction.