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