On which mountain is the mammoth cave?

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

What term is given to the border between the central alps and the southern limestone alps?

What structure on the south african coast has a range of 63 km and releases flashes every 30 seconds?