Answer:
A. Since ancient times, people have used waterways for transportation.
B. When natural waterways are too difficult to navigate, people sometimes dig canals to provide a better means of transportation.
D. Canals are man-made waterways that change the natural landscape to meet human needs.
Explanation:
- In the old days, when there was no engine, which runs cars, airplanes and ships, the means of transport were quite different. They were moved by the force of animals, like carriages, by the force of the winds and the waters, like the caravels. The Europeans saw in the caravels the opportunity to make trades between distant regions. Thus, they served as a means of transport for Asian spices such as pepper, ginger, nutmeg, saffron, clove, cinnamon and silk. In addition, the great owners of the caravel squads, like Portugal, Spain, Holland, England and France, managed to find lands previously unknown.
- When natural waterways are very difficult to navigate, people sometimes dig channels to provide a better means of transportation. With the canalization, the limitations of the minimum flow and declivity of the natural pathways disappear. This way the navigation becomes much easier and efficient
.
- Vessel navigation Canals are structures constructed to accommodate the passage of ships from one point to another. There are several types, both natural Canals , and rivers displaced to facilitate navigation and also fully constructed channels artificially.
