private static void createTrees(int width, int height) {
		Random rand = new Random();
		
		for(int i = 0; i < width; i++) {
			if(rand.nextInt(10) == 9) {
				if(blockSheet[i-1][dirtBoundary-1] == World.AIR) {
					for(int x = 0; x < tree.length; x++) {
						for(int y = 0; y < tree[x].length; y++) {
							if(x + i < width - tree.length && y + dirtBoundary < height) {
								blockSheet[x+i][y+dirtBoundary - 6] = tree[x][y];
							}
						}
					}
				}
			}
		}	
	}