Which one of the following is not a natural cause of climatic change
a. volcanic
b. earth's tilt
c. solar activity
d. human activity

The symbols found on the map below indicate where fossils have been found in the same layer of sediment. each unique symbol represents fossil locations of a particular species.

Two ways government can build a good relationship with citizens?

Why did activists use social media during the 2011 uprisings in egypt?