How many pairs of record low temperatures that have a difference of 30?

How is north pole different from south pole geographically? Did the Guptas figured out the earth was round by observing lunar eclipses? How many electrons must be gained or lost for selenium to achieve a noble gas electron configuration? What is the average the tempriture of Saturn in digreese celsius? What is chemical equation for acetylene being burnt during some acetylene welding? What is the lyre notes in fire works? What is spiking in ruby laser? Why do humans produce catalase? What state is the mouth of the Missouri River located? What type of rock has course-grained crystals of all different shapes and sizes? What is 1liter? Why is land not washed away in heavy rain and wind? What is the relationship between two species living together and the other is not affected called? Where was the Eyjafjallajokull volcano? Is petrol a waste product? Indication of a negative result with Bial's Reagent? Is there any sort of parasite or living organism lives on mosquito? How do the formulas of salts relate to their names? What is the technique for pouring off the liquid at the top of a container with an insoluble substance? Yeast cells perform what kind of fermentation?