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

Sponge: a piece of a soft, light, porous substance originally consisting of the fibrous skeleton of an invertebrate but now usually made of synthetic material. Sponges absorb liquid and are used for washing and cleaning.

Trace: to find some or something that was lost.

Mold: a soft green, gray, or black growth  that develops on old food or on objects that have been left too long in warm. slightly wet places.

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. 

Mud: earth that has been mixed with water.

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

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.

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

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.

Trilobite: a simple, flat sea creature that lived in the earlies period of life on aerth, with a hard outer layer and a body in three parts.

Footprint: an impression of the foot on a surface.