Unpredictable floods, small & defenseless region, and limited Natural Resources
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Three environmental challenges to the Sumerians were:Unpredictable floodingNo natural barriers for protectionThe natural resources were limited for the Sumerians.
First three fingers.
Natural minor
All elements have some isotopes that undergo radioactive decay, the question is how fast.Aluminum comes in three major isotopes, each with their own half-life:Al-26: 730000 years - 0% in natural aluminumAl-27: Stable - 100% in natural aluminumAl-28: 2.3 minutes - 0% in natural aluminumSo as natural aluminum is 100% Al-27 it does not undergo radioactive decay
You play it like a G but also press the first button on the bottom.