When studying seismic records from all over the globe, what did scientists find out about the pattern of earthquakes?

a-many earthquakes are concentrated in narrow zones near earth's poles.

b-many earthquakes are concentrated in narrow zones at the centers of plates.

c-many earthquakes are concentrated in narrow zones along plate boundaries.

d-most earthquakes occur deep under the ocean.

(i was thinking c but i'm not

The answer is C-Many earthquakes are concentrated in narrow zones along plate boundaries.

C

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a