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# The order of magnitude of the mass of Earth's atmosphere is ##10^18## kilograms. The order of magnitude of the mass of Earth's oceans is ##10^3## times greater. What is the order of magnitude of the mass of Earth's oceans?

##10^21##

In general ##color(white)("XXX")b^pxxb^q =b^(p+q)##

Therefore ##color(white)("XXX")10^18 xx 10^3 = 10^(18+3) = 10^21##