Dinosaur - a big wild animal lived a long time ago. , Skull - The bones in the head of a man or an animal , Ravin - A small deep narrow valley. , Examine - to look carefully at something or someone , Discover - to find something for the first time, Excavate - to dig in the ground to find old things , Layers - flat things lies over each other , Paleontologist - a person who studies old dead bodies of animals, plants or fossils , Sedimentary rock - a type of rock formed from sand, stones, mud, Pastime - something that you like doing when you are free, Ash  - The gray powder that is left after burning ,

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