Mud: earth that has been mixed with water.

Amber: hard translucent fossilized resin produced by extinct coniferous trees of the Tertiary period, typically yellowish in color.

Tar: a dark, thick, flammable liquid distilled from wood or coal, consisting of a mixture of hydrocarbons, resins, alcohols, and other compounds. It is used in roadmaking and for coating and preserving timber.

Dinosaur: are a group of reptiles that dominated the land for over 140 million years (more than 160 million years in some parts of the world). They evolved diverse shapes and sizes.

Trace: to find some or something that was lost.

Carbon: is a very abundant element. It exists in pure or nearly pure forms – such as diamonds and graphite – but can also combine with other elements to form molecules. 

Mineral: is a naturally occurring inorganic solid, with a definite chemical composition, and an ordered atomic arrangement. 

Cast: an object made by puring hot liquid into a container and having it to become solid.

Horseshoe: a shoe for a horse formed of a narrow band of iron in the form of an extended circular arc and secured to the hoof with nails.

Impression: a mark made on the surface of something by pressing on object into ir.

Fossil: the shape of bone, a shell, or a plant or animal that has been preserved in rock for a very long period.

Sediment: a soft substance that is like a wet power and consists of very small pieces of a solid material that have fallen to the bottom of a liquid

Crab: a crustacean with a broad carapace, stalked eyes, and five pairs of legs, the first pair of which are modified as pincers. Crabs are abundant on many shores, especially in the tropics, where some have become adapted to life on land.