Basically there are 2 types of fossils that exist, Body Fossils and Trace Fossils. Body Fossils include parts and remains of animals that were once alive. These are usually only the hard parts of animals, such as bones, teeth, and shells. Trace Fossils are more like footprints, trails, or imprints of animals rather than actual evidence of the animal or plant itself. The word fossil comes from the Latin word "fossilis", which means "dug up". Fossils are made over time after an organism dies and is usually buried by a natural process, such as sinking into the mud. Over time, more and more sediment covers the remains and it becomes pressed down, or impacted. After a long time, the remains are no longer made up of the same materials, but undergo a change and are more like rock.
This is an example of a Trace Fossil. You can see the footprints of a creature from long ago!
This is an example of a Body Fossil, where you can actually see the fossilized remains of an organism.
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