B. Embankments, packed dirt and or stacked stone placed to keep water out.
The ocean floor and its depth vary a lot from place to place. Maybe it is expected that the central parts of the oceans would be the deepest parts of them, while the closer the ocean floor is to the land it will be shallower, but that is not the case.
The central parts of the oceans have mid-ocean ridges. The mid-ocean ridges are volcanic underwater mountain ranges. There is constant propelling of magma, and as the magma cools off quickly it creates new crust. This results in the mid-ocean ridges gaining heights of up to 1.5 km above the surrounding area.
The further away we move from the mid-ocean ridges, or rather being closer to the oceanic margins, the depth actually increases. The reason for this is the erosiove power of the water, but also the subduction zones. The erosion manages to flatten the ocean floor, thus making it deeper, while the subduction zones are the places where the oceanic plate is moving downward toward the mantle, and it create ocean trenches which are very deep, in fact the deepest parts of the oceans.
Small rivers and streams around the Colorado River drain into the river and eventually to the ocean.
Explanation:
The Colorado River is a major river in the United States. This river runs through the southwestern part of the country, mostly through semi-arid and arid areas. The Colorado River starts its flow in the state of Colorado, continues its flow through Utah and Arizona, then leaving the United States and having a short span in Mexico until it enters the Gulf of Mexico. The river is fed with water through numerous smaller rivers and streams, which makes it larger and larger gradually, and all that water enters the ocean at the end.
- Some of the tributaries of the Colorado River and Green, San Juan, Little Colorado, and Gila.
- All of these rivers have their own watersheds, all of which are small, but they all together fall into the large watershed of the Colorado River.
- The Colorado River is very important river in the region, especially when it comes to agriculture.
- The most famous thing about the Colorado River is that in one part of it is located the world famous Grand Canyon, which is a major tourist attraction.
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A. Used fire to do controlled burns
The result of controlled burns were highly beneficial to both the Aborigines and the environment. The burnt remains of the burns were very fertile and encouraged the growth of new vegetation that would not have been able to flourish if the older growth had not been removed. The removal of old vegetation also resulted in a low chance of wild fires. Further more new vegetation was able to attract wildlife to graze, making hunting easier.
The concept of controlled burns is still used today and was/is also practiced by First Nations in North America.
