AGS / Geohazards / Land Subsidence / Main. Land subsidence is defined as the lowering of the land surface. Many different factors can cause the land surface to subside. Subsidence can occur rapidly due to a sinkhole or under ground mine collapse, or during a major earthquake. Subsidence can also take place slowly, becoming evident over a time span of many years. In either situation, subsidence can result in millions of dollars of damage.
4,784 pages on this wiki. Cobalt Ore is a hardmode ore that has a 50% chance of being spawned in a world after destroying one Demon Altar or Crimson Altar. At least a Molten Pickaxe is required to mine Cobalt Ore. Terraria-How to get new ores and destroy demon altars.
Certain blocks that normally turn into something else when mined can be collected with a Silk Touch tool. For example, grass would normally be turned into dirt, but you can use a silk touch tool to collect grass blocks (great if you want to grow a lawn underground or in the Nether).