1.   An array a square kilometre in size should see neutrino sources if there are any, Halzen says.

2.   It has more cars per square kilometre than anywhere else in the world.

3.   So far palaeontologists have only scratched the surface of a formation that Rauhut estimates covers at least several hundred square kilometres.

4.   The densities per square kilometre of its human and livestock populations are greater than anywhere else in the continent.

5.   The pack ice and fast ice that spread over polar seas form vast sheets many hundreds of square kilometres in area.

6.   If formed from viscous magma they are normally limited in lateral extent but where composed of basic rocks they may extend for thousands of square kilometres.

7.   He said a two square kilometre area in the neighbouring Cheremshensky branch of the Volga had been contaminated by the discharge of radioactive waste water.

8.   An area of several square kilometres around the main university campus, where security forces violently broke up a protest early Saturday morning, remained sealed off Tuesday.

9.   Their habitat originally covered one million square kilometres but only about two percent of the area remains, the WWF said.

10.   Under the peace treaty signed a week ago, Israel is to hand back several hundred square kilometres of land to Jordan.