We need to use negative numbers for sub zero temperatures and for distances between the highest peaks on earth and the deepest points in the oceans and deep mines.
Mauna Kea’s summit is 4205 metres above sea level but it extends below the sea surface to a depth of -6000 metres. This makes Mauna Kea taller than Mount Everest. Why is it taller and by how much?
What is the difference in the heights of the highest peak on earth and the deepest point on the ocean floor?
What is the difference between the highest and lowest temperatures recorded at the South Pole?
How much hotter was the hottest day compared to the coldest day ever recorded in South Africa?
How much colder was the coldest day recorded at the South Pole compared to the hottest day recorded in Death Valley?