I know that you can see the oldest layer on the bottom and the youngest is on the top. This happens because when more layers are added then the ones on the bottom become the oldest.
This picture is a good example of rock layers.
Erosion is caused by wind, water, heat and chemicals. The rock could be bigger by the water and it can form into something that it wasn't before. Erosion can also change the rock because it can melt.
What Happens to Rocks When Forces Act on Them
Some rocks will bend due to heat and pressure. They will start to bend and stay like that. Others will break and crack during an earthquake. They will stay like that and that is how these rocks are sometimes different to other rocks.
How They Know the Age of Rocks
A radioactive dating technique used to determine the absolute age of rock particles may be used to determine the age of the crystals material including direct dating of rocks. Geologists generally know the age of rocks by determining the age of the group of rock or formation.
Did you know?
Did you know that when you find a rock it could have been very small, but with the rain it could have got bigger ever time it rains.
Did you know that this rock was so small you can throw to the ground and smash it, but with all the rain it turned big and here's the picture that shows you that it actually did.