One million grams is equal to one (metric) tonne. There are 1000 grams in 1 kilogram and 1000 kg in 1 tonne.
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45 million tons = 4.08233133 × 1013 grams
Every ton has a million grams, so you multiply the number of tonnes by a million.
1 picogram = 10-12 grams So 1 million picograms = 106 picograms = 10-6 grams
10 grams = 10,000,000 (ten million) micrograms
No 1000 kilograms is 1 000 000 grams