(of a species, family, or other group of animals or plants) having no living members; no longer in existence
EXTINCT
The period of time before written records.
PREHISTORIC
A three-dimensional representation of a person or thing or of a proposed structure, typically on a smaller scale than the original.
MODEL
An internal or external framework of bone
SKELETON
A fossil reptile of the Mesozoic era, in many species reaching an enormous size
DINOSAUR
A picture illustrating a book, newspaper, etc.
ILLUSTRATION
The remains or impression of a prehistoric plant or animal embedded in rock and preserved in petrified form.
FOSSIL
An exact copy or model of something, especially one on a smaller scale.
REPLICA
The process of eroding or being eroded by wind, water, or other natural agents.
EROSION
A small body of matter from outer space that enters the earth's atmosphere.
METEORITE
The study of the physical and natural world through observation and experiment.
SCIENCE
A very large dinosaur with a small head and long tail that could walk on either two or four legs.
IGUANODON
A person who studies or is an expert in the branch of science concerned with fossil animals and plants.
PALEONTOLOGISTS
Any of the pieces of hard whitish tissue making up the skeleton in vertebrates.
BONES
Make (a hole or channel) by digging.
EXCAVATE