The correct answer is comparison. This kind of memory strategy is where an individual likely to focus on having to base a particular information to previously known information, thought, or idea that an individual already knows of in order to have a knowledge of the particular information.
The answer to your question is,
because the water slows down, the sediment drops to the bottom
-Mabel <3
To shortly answer your question, an ethic community is a community of people who relate to each other in terms of culture, traditions, and overall ethnicities. An example of an ethnic community (I am speaking on myself) would be Juneteenth. In no way do I mean offense, it is just a mere example. If you need better understanding, let me know and I will gladly assist you.
Some answers you may be looking for are the American Flag, the Statue of Liberty and the Liberty Bell. hope this helps :)
The answer is Seismoscope