Snow is added automatically with the DragonVale seasonal updates.
Snow+Fog Snow+Storm
Dragonvale changes seasons in their updates. If you still have snow after winter has passed, check your app updates to see if DragonVale is included.
Snow dragon
You buy it. It costs about 3,000,000
You can't breed these, you need to buy them with your coins.
1 day
It is actually an epic breeding island. It can be purchased in the marketplace.
I think you have to be level 16 to summon a third island.
You have to buy it. It is one of the main base dragon.
You have to use 2,500,000 dragoncash to buy it.
Yes, the ruby dragon does live on gemstone island.
I'm pretty sure you breed an air with a cold, but I'm not positive