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 total lunar eclipses relatively common and total solar eclipses rather rare? Lunar eclipses can be seen from half the Earth at once, while solar eclipses can be seen from within only a relatively narrow path across the Earth's surface.