Calculate the mean annual temperature change using the data in the chart .

10.5833

Explanation:

for the mean you have to add all of them and divide by the numbers

Mean= total of the observations / number of observations

-5+2+6+10+15+22+24+21+17+12+6+(-3)=127

Mean= 127/12= 10.5833

the precambrian aged rocks could be found in australia. australia is a region that has a lot of ancient civilization history from million years ago. in this region, there are a lot of recognizable fossils buried in its land which is considered a precambrian-aged rocks