January 2011 Mock: Question 15

15a) objects that could collide with earth and be potentially damaging to out enviroment

15b) so they can make the necessary precautions if one is coming towards the earth

15c) 1- Craters on eart such as the barringer crater in arizona
2- the fact Uranus is flipped on its back

15d) probe: Rosetta
Target: 67P
Information: collected sample of the nucleus