simple . . it's because the glacier melted . . . The snow actually forms a glacier through a long process...a metamorphosis of sorts. Snow (which is an ice crystal) falls in an area that stays cold...
Yes...in Pokemon Platinum only though. You get some item called the Gracidea flower. Make sure you have Shaymin in your group then go to floraroma town there you will see a blond haired girl in the...
It changes back to Land Form at Nighttime and It goes into Sky Form in the Daytime. If you don't want Sky Forme at all then start over without a Gracidea Flower.