Answer:
They are lakes Superior, Michigan, Huron, Erie, and Ontario and are in general on or near the Canada–United States border.
Freezing point of the water is innate property. Therefore, I would say that the freezing point of water from 1 billion years ago would still be the same as to what temperature the water would freeze today. Thus, I choose letter D. 0°C.
Extremely hot, forms in mantle, known as lava in surface, contains dissolved gasses
