Which of the following mountain ranges marks the line between europe and asia?

a. elburz
b. alps
c. caucasus
d. ural

The correct answer is - D. Ural.

The Ural mountain range is the separating line between Europe and Asia. Geographically speaking it is one continent, Eurasia, not two, but the separation has occurred due to other things. The Ural Mountain Range had been a border between Europe and Asia for millenniums, and that was based not on geography, but on culture, language, religion, lifestyle, race... The division arose because the people west of Ural, and the people east of Ural were different in most things, while the people on the west were white skinned, had languages from the Indo-European branch, were mostly living in villages, towns, and cities, the people from the east were darker skinned, had almond like eyes, were nomads that roamed over vast areas, had languages from different linguistic branch...  

places of higher salinity. there are parts of the ocean where hardly any rain falls but warm dry winds cause lots of evaporation. this evaporation removes water – when water vapour rises into the atmosphere, it leaves the salt behind, so the salinity of the seawater increases. this causes the seawater to become denser.

separation of church and state? not sure what you mean.