Sources of error are basically sources of uncertainty in your measurements. Every measurement, no matter how precise we believe it to be, contains some uncertainty simply because of how we measure it.
Answer:
The amount of carbonate, a main building block in sea water, is reduced by ocean acidification. This makes it harder for marine organisms to shape their shells and skeletons, such as coral and some plankton, and existing shells will begin to dissolve.
<span>The Great Mosque that we see today is its third reconstruction, completed in 1907. According to legend, the original Great Mosque was probably erected in the 13th century, when King Koi Konboro—Djenné'stwenty-sixth ruler and its first Muslim sultan (king)—decided to use local materials and traditional design techniques.</span>
I would think they are around B. 11 years old
