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.
First, dig a 1- or 2-foot trench where the levee will go. Fill this trench with your most impervious material, such as clay, to make a small foundation. Griggs says this core will help cut down on underseepage, the flow of water under an earthen levee that can lead to its collapse.