Earth world

4. force upon a surface by an object,fluid.
5. the process by which the surface of the earth is worn away by the action of water,glaciers,winds,waves,etc.
7. a period of time marked by distinctive character,events.
8. remains, or trace of a living thing of a former geologic age,as a skeleton or footprint.
10. the ejection of molten rock.
13. one of the structures composing the skeleton of a vertebrate.
14. a substance obtained by mining.
15. the star that is the central body of the solar system.

1. a class of individuals having some common characteristics or qualities;distinct sort or kind.
2. types of rock that are formed by the deposition of material at the earths surface.
3. a large amount of species that die.
4. the act or process of petrifying.
6. any flow of electric charge through a gas,liquid or solid.
9. the act of adapting.
11. period of the Paleozoic era from 500 to 425 million years ago.
12. period of the Paleozoic era occurring from about 280 to 230 million years ago.