Rocks with small crystals form above ground, because when formed under ground the magma makes the rock cool slower causing more time for the crystals to grow. Above ground the rock cools faster, because the air isn't as hot under ground than above ground.
The answer would be sea level because it is not above sea level nor is it under sea level
Cabbages grow above ground
Experts do not recommend using plywood under and above ground pool to level it. Even with plywood you would have to level the ground underneath and you would need a layer of sand. Plywood may warp over time and that would result in you having to take the pool down to remove it.
Tomatoes are fruit which develop at the base of flowers on tomato plants, this occurs above ground level.
it grows above ground
No, they are under water but not under ground. There is no ground above them.
The fruit of the Capsicum grows above ground.
sunflowers grow above ground .
So that the water doesn't drain out of the pool and so the pool doesn't fall over. I agree with the answer above but I have a more detailed answer. In a round above ground pool the water puts even pressure on the pool walls, and if the ground is not level one side will get more pressure. The imbalance will cause the pool to collapse under the strain.