Use the image to answer the question.
A satellite image of a river delta. On the bottom right side of the photograph is land with mountains and trees. A river comes from the bottom of the image and goes upwards. On the top right of the image is a body of water. As the river enters the body of water, it branches out into several smaller streams of water. At the locations where the river enters the body of water, there is a light-colored substance.
The image is a photograph of the Yukon River delta in Alaska. Describe how the delta could be changed over time.
(4 points)
Short Answer Rubric (4 points)
Points Awarded Criteria
4
The answer is very clear.
The answer is fully supported by details.
There may be a few errors in grammar, usage, or mechanics. Errors do not interfere with meaning.
3
The answer is mostly clear.
The answer is supported by mostly relevant details.
There are a few errors in grammar, usage, or mechanics. Errors do not interfere with meaning.
2
The answer is somewhat clear.
Details are weak or not related.
There are some errors in grammar, usage, and mechanics. Errors interfere with meaning.
1
The answer is not clear.
There are few or no supporting details.
There are many errors in grammar, usage, and mechanics. Errors interfere with meaning.
0 The question is not answered.
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Over time, the delta could change in several ways.
Firstly, the main river channel could shift and change its course due to the flow patterns and erosion. This could lead to the formation of new distributaries or channels, and the abandonment of older ones. As a result, the shape and size of the delta could change as new paths are formed and old ones are filled in with sediment.
Secondly, the deposition of sediment could cause the delta to expand and grow larger. As the river enters the body of water, the velocity of the water decreases, causing sediment to settle and accumulate. This could result in the delta extending further out into the body of water and increasing in size.
Additionally, the amount and type of vegetation on the delta could also change over time. Vegetation plays a crucial role in stabilizing the delta and preventing erosion. As the delta grows and changes, different plants may be able to thrive in the new conditions, leading to a shift in the type and distribution of vegetation on the delta.
The light-colored substance observed at the locations where the river enters the body of water could be sediment or mineral deposits carried by the river. Over time, these deposits could build up and change the composition of the delta.
Overall, the delta could undergo significant changes in its size, shape, vegetation, and composition over time as a result of natural processes such as erosion, deposition, and vegetation succession.