The seafloor is made of a layer of unconsolidated or loose sediment. However, what that loose sediment actually is varies by sea and location within the sea, among other things. The sediment comes from a variety of sources, such as remains of dead sea creatures, chemical precipates from the water itself, eroded material from land, ash from volcanoes, and even interstellar dust!
Here are some examples of what seafloors might look like:
This is a picture of sediment taken from the Chesapeake Bay, in the US:
Here is a map of the seafloor distribution of the waters off of the south coast of England:
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