They are called mangroves.
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The dense particle is called a nucleus. It contains protons and neutrons and is located at the center of an atom.
When something is not as dense as water, it is said to be less dense or have a lower density than water.
This tendency is called buoyancy. It is a result of the fact that the weight of the displaced fluid is greater than the weight of the object itself, causing it to float.
In the Mediterranean Sea the cool dense water sinks under less dense water which is called density current.
Brown algae, specifically the species Macrocystis pyrifera, is responsible for the formation of kelp beds along the North American coasts. These large brown algae can form dense underwater forests that provide habitats for various marine organisms.