to make tnt explode you can either A. put a redstone torch next to it B. Put a button next to it and push it C. put a lever down next to it and activate lever D. place a presure pad infront of it and step on the pad
To destroy things on minecraft hold down your left mouse button, to change go in options and controls
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If you mean classic (Which I think you do) It wasn't made to explode (as is: It can't)
I assume you mean TNT. All you have to do is hit it.
You have to destroy snow with a shovel, you can not craft it.
Guns can't be made in Minecraft without modding.
Destroy cactus blocks in desert biomes and then plant it on sand.An it will grow.