When fresh water and saltwater meet<span> in an estuary, they do not always mix very readily. Because </span>fresh water<span> flowing into the estuary is less salty and less dense than water from the ocean, it often floats on top of the heavier </span>seawater<span>.</span>
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Explanation:
The American colonies declared their independence
Islam spread to various locations in various periods but the first place from which and to which it spread would be D - from Mecca and Medina through Arabia. Islam eventually spread even to further lands such as Europe, the US and Asia.