The ocean monuments from the Release 1.8 Minecraft update introduce 4 new blocks (prismarine, prismarine bricks, dark prismarine, and sea lantern), 2 new mobs (guardians and elder guardians), and 2 new items (prismarine shards, prismarine crystals). You can use these items to craft 3 of the 4 new blocks.
What is a natural levee and how is it made? -Natural Levees are formed by the river in its process of flooding -A natural levee is formed by a deposit of sand or mud built up along, and sloping away from, either side of the flood plain of a river or stream.
Formation of natural levees by spill-over of sediment during floods. Next to the channel mostly sand is deposited (highest flow velocities), and sand compacts less than the mud that is deposited farther away. Thus, over time these near-channel sand deposits will over time rise above the (more compacted) floodplain and form natural levees. Overview of features associated with meandering streams.