One Meteorite would take out half the surrounding area equal to 10+ Nuclear blast. Something like that truly hitting the planet would end almost all life and leave the skies black for hundreds of years.
Keep in mind, Madara can summon more than just one. I believe Deidara would probably be able to take down only one of them at best, and then he would be dead afterwards.
it'd obiterate that meteor, the blast is 10 km, as inconsistent as size is in this manga, there's no way that meteor is 10 km, maybe 5 at most, but not 10