Scientists are best equipped to show the connection between extreme weather events and climate change when the effects are closely related to temperature. Extreme heat and extreme cold are the easiest to attribute to climate change, followed by drought and extreme rainfall.
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1, 3, or 5 Minute Drills for Addition Worksheets. An addition drill is a worksheet with all of the single digit problems for one operation on one page. A student who has memorized all of the single digit addition problems should be able to work out the 100 problems correctly in 5 minutes, 60 problems in 3 minutes, or 20 problems in 1 minute.