One day, the rains will return. If you remove the grass, at that time nothing will keep the soil from washing away. Using rock will slow down the pounding of the ground by the rain and will allow the rain to infiltrate the soil. You want that. Otherwise, you will just suffer run-off.
Use a light colored rock to reflect sun-heat. You don't want to cook the tree roots or sterilize the soil of beneficial microbes by using dark rock, which will just absorb more heat.
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