4) During a paticularly cold winter, the Black Sea froze over. The Adriatic Sea, which is just to the East of the Black Sea and on the same latitude, did not freeze. The Black Sea has an average
salinity of 18 ppt. What can be assumed about the Adriatic Sea?

maritime tropical may be your answer.

well, i believe that the answer is 2. : 3

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this