Potash cash operating cost of goods sold net of by-product credits, which we define as total cost of goods sold excluding royalties, depreciation, depletion and amortization, was $199 per short ton in the first quarter of 2010 compared to $238 per short ton in the first quarter of 2009.
Answers.comÂ® is making the world better one answer at a time. It is relativley rare to observe a solar eclipse because the sun's light is blocked by the moon.
Why are solar eclipse so rare? The sun must be within 5 degress of the earth-moon plane for an eclipse to occur. The penumbra must be in line with the umbra for an eclipse to occur. There must be a new mo â¦ on for a solar eclipse to occur. None of the above