What Is Metamorphic Rock?

The force that's pushing all of those rock pieces together, along with the water which acts like a glue or cement, is what binds those little rock pieces together into a new sedimentary rock. The interesting thing though is that sometimes the glue is soft, just like paper glue and so the rocks are not bind so hard. Sometimes the glue is really tough, like super glue and the rocks are stuck together, the sediment are stuck together and the rock is really hard. It just depends on what Mother Nature really wants to throw at us.