You have to be in the Hell biome and the ghast needs a 5x5x5
Water
Ghast tears are used to make many potions.
When you kill a Ghast you often get a "Ghast Tear" which you use to make potions.
once again possible but are in minecraft :)
Ghasts are estimated 6X bigger.
You can spawn it anywhere. If you want to let it go, release it outside of your house. If you want to keep it, Build something out of bedrock. (Do this in creative or else the ghast can kill you.) P.S Bedrock is unbreakable unless youre in creative you can break it
The only way to spawn herobrine in minecraft is to use mods as you cannot spawn him in vanilla minecraft.
A dungeon in Minecraft can spawn on any level that normal land can spawn on
Because of its looks, it looks sad. Like it is crying. That is what i presume
Wolves will sometimes spawn in forests in Minecraft PE 0.9.0 and above.
No, currently in vanilla Minecraft dinosaurs are not in the game. This means there are no spawn eggs for them.
You go to the Nether. Then wait for a ghast to shoot a fireball at you. Just before it hits you, attack the fireball with a sword. It should shoot back and kill the ghast.