number expressing the central or typical value in a set of data. Total of numbers divided by the number of items. To add numbers then divide by the number of items.

situated in west, or directed towards or facing west. film, television drama, or novel about cowboys in western North America.

Geology The molten rock material under the earth's crust, from which igneous rock is formed by cooling.

in space separating things. From one person, thing, or place, to another.

process of species being extinct.

Strongly wishing to do/get what you want. To control exactly how something will be or act.

act of stretching one's limbs or body. To make your arm, leg muscles long to ease them.

parts left over after other parts. Bodies of human or animals after it has died. To stay in a place when other people have gone.

Being talked about in the media.

Appearing or getting involved where not wanted.

relating to study of earth's physical structure and substance.

(E.g. of a temperament) easily angered; violent.

Existing in large numbers.

group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. Subsections of a genus (of plants, animals).