Limestone:Limestone is a sedimentary rock made of calcium carbonate

Amphibian:a cold-blooded vertebrate animal of a class that comprises the frogs, toads, newts, and salamanders. They are distinguished by having an aquatic gill-breathing

Paleontologist:a scientist who specializes in the study of life forms that existed in previous geologic periods, as represented by their fossils.

Asteroid:a small rocky body that orbits the sun. A large number of these, ranging in size from almost 600 miles (1,000 km) wide

Ocean:a very large expanse of sea, in particular each of the main areas into which the sea is divided geographically.

Prehistoric times:History of humankind in the period before recorded history.

Granite:a very hard, granular, crystalline, igneous rock consisting mainly of quartz, mica, and feldspar and often used as a building stone.

Earth:the planet on which we live; the world.

Arthropod:an invertebrate animal of the large phylum Arthropoda, such as an insect, spider, or crustacean.

Rabbits:a burrowing, gregarious, plant-eating mammal with long ears, long hind legs, and a short tail

Reptile:a vertebrate animal of a class that includes snakes, lizards, crocodiles, turtles, and tortoises. They are distinguished by having a dry scaly skin and typically laying soft-shelled eggs on land.

Coyotes:Canid mammal similar to the wolf, but smaller, longer ears, sharp snout, and gray-brown fur