Carbon : a chemical element that exists in its pure form as diamond or graphite, and is an important part of other substances such as coal and oil, as well as being contained in all plants and animals

Fish : an animal that lives in water, is covered with scales, and breathes by taking water in through its mouth, or the flesh of these animals eaten as food

Mud : earth that has been mixed with water

Footprint : the mark made by a person's or animal's foot

Horseshoe : a U-shaped piece of metal that is attached to the bottom of a horse's hoof to protect it

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

Mineral : a valuable or useful chemical substance that is formed naturally in the ground

Crab : a sea creature with five pairs of legs and a round, flat body covered by a shell, or its flesh eaten as food

Mud : a substance that consists of very small grains of rock, found on beaches and in deserts

Preserved : to keep something as it is, especially in order to prevent it from decaying or being damaged or destroyed

Trace : to find someone or something that was lost

Sponge : a soft substance that is full of small holes and can absorb a lot of liquid, and is used for washing and cleaning