It reaches its maximum, as the pressure is the result of the weight of the overlying material.Given that the gravitational field falls to zero at the centre of a large body (e.g. the earth), what happens to the pressure curve?
That I can't answer. Perhaps someone here can provide the math.What would the curve look like and what would the formula be?
High temperatures have an effect on the radial distribution of ρ.There would be no effects due to high temperature. What matters is the radial distribution of ρ.
As you approach the center, less and less mass is added to the already overlying material. Hence the pressure gradient will be at its minimum.It reaches its maximum, as the pressure is the result of the weight of the overlying material.