Question

The swimming pool of the Great Bath was made watertight with burnt bricks and mortar lined with bitumen and

a)lime
b)gypsum​

Answer 1

Answer:

I think gypsum is the answer

Answer 2

Answer:

The floor of the tank was watertight due to finely fitted bricks laid on edge with a gypsum plaster, and the side walls were constructed in a similar manner. To make the tank even more watertight, a thick layer of bitumen (waterproof tar) was laid along the sides of the pool and presumably also on the floor.