* Gigagrams to grams: 1 gigagram (Gg) is equal to 1,000,000,000 grams (g). So, 10 gigagrams is 10 * 1,000,000,000 = 10,000,000,000 grams.

* Scientific Notation: Scientific notation expresses a number as a product of a number between 1 and 10 (inclusive) and a power of 10. In this case:

10,000,000,000 grams = 1.0 x 10^10 grams

Therefore, 10 gigagrams in scientific notation is 1.0 x 10^10 grams.