1.spiders would be tiny

2.stone would not catch fire

3.lava would burn and melt its way to water and create an island

4.you would not mine with pickaxe you would just make little holes then you have to stick pegs of dynamite

5.caves would collapse sometimes

6.there would be about 110 more elements in the game e,g, helium,radium,magnesium and silicon

7.obsidian would be breakable with iron pickaxe and also obtainable

8.instead of just dying you would be badly injured

9.no respawning EVER!

10.villagers would have armys and wall and could ride horses and fight for themselves

11.iron golems would be way more powerful

12.the nether would be way more sinister and have demons

13.boats would be bigger

14.there would be rapids in rivers

15.there would be about more than 500 more mobs including beetles and butterflies

16.there would be no invincible

17.there would be dynamo near bedrock(iron melting and be electrified)

18.you would die of heat at bedrock

19.at about 230 blocks high in the sky you would suffocate

20.after burning log with flint and steel when it burns out there should be burnt log

21.there would be meteor showers

22.earthquakes

23.pollution

24.it would take 20 dyes to dye a single sheep

25.when horses throw you off you would get thrown way farther and get hurt

26. bedrock would appear on the surface and would be breakable

there is more to this it would be really long though so lets just say

WHY ISN'T MINECRAFT REALISTIC!!!!!!!!!