When was it?
Fossils are the remains or evidence of an ancient organism preserved in what material?
What is a Sedimentary rock?
The fossils of a bony structure of an animal's body are found. This bony structure was used to give the animal support to hold them up. What was found?
What is a mineral replacement of the skeleton?
Sometimes a bone is a fossil, but an impression or track left in a soft surface can also be fossilized. What is this impression or track called?
What is imprint?
When a fossil is made, first an animal dies and sinks into the sand or mud. Then its muscles and skin rot away and it turns to rock over millions of years. Then the ________changes and part of the fossils shows, making it possible for the fossil to be discovered.
What is earth?