The richter scale is most common in the united states, but the mercalli scale is most common worldwide
Coal/ fossil fuels is most likely the answer.
Answer:
Secondary sources : The data which are found from individual person, organizations, agencies, books, journals, magazines, annual reports, etc. are secondary sources of population data.
Answer:
Explanation:
Given:
B is at (4,3) and D is at (-2,-4).
Solution:

⇒ 
⇒
Therefore the answer is 
-70+40 is like subtracting 70 and 40, but adding a negative sign in front. The answer is -30