Which of the following was a significant challenge in building the Panama Canal? Frequent rains caused rivers to flood.
Engineering plans were often wrong.
Workers went on strike to get extra pay.
Congress did not provide enough money..

explanation:

the president, prime minister, chief justice, speakers and ministers take their oath of office. the oath is taken in bengali

this forms a narrow, steep sided inlet (sometimes deeper than 1300 metres) connected to the sea. the terminal moraine pushed down the valley by the glacier is left underwater at the fjord’s entrance, causing the water at the neck of the fjord to be shallower than the main body of the fjord behind it.

it allows shippers to carry commercial goods, which allows them to save time and money.