the bones in the head of a person or an animal
skull
the gray powder that is left after something has completely burned
ash
something that you like doing when you are not working
pastime
to dig in the ground to look for old objects or buildings that have been buried for a long time
excavate
a type of rock formed from sand, stones, mud, etc., that settles at the bottom of lakes or other bodies of water
sedimentary rock
something flat that lies on another thing or that is between other things
layer
a big wild animal that lived a long time ago
dinosaur
to look carefully at something or someone
examine
a person who studies very old, dead animals or plants as fossils
paleontologist
a small, deep, narrow valley
ravine
to find or learn something for the first time
discover