ash - the great powder left after something that has burned , dinosaur - a big wild animal that lived a very long time, discover - to find or learn something for the first time , examine - to look carefully at something or someone, excavate - to dig in the ground to look for old objects, layer - something flat that lies on another thing , paleontologist - a person who studies very old, dead animals or plants as fossils, pastime - something that you like doing when you are not working , ravine - small, deep, narrow valley, skull - the bones in the head of a person or animal,

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