Which element leaves yellow deposits where it's found in the landscape, and is called "brimstone" in the bible?

The answer is sulfur.

According to the Bibical view the center of the earth was made of the element called brimestone which is also called as burning stone. Now the element is commonly known as sulfur. This sulfur dwells deep inside the earth. The researchers also estimated that the core of the earth has 10 times more sulfur than rest in the world. This element also leaves yellow deposits where it is found in landscape.

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.