Alfred Wegener proposed that all the countries were once part of a super-continent called a. Panwanaland
b. Earth 1
c. Panfrya
d. Pangaea​

D. Pangea

Wegener proposed that the continents were once compressed into a single protocontinent which he called Pangaea, meaning "all lands", and over time they have drifted apart into their current distribution.

The freezing point of the ice is lowered because of the rock salt which then allows the ice to observe heat from the ice cream mixture without it melting.