The combination of fertile soil and from rivers made mesopotamiathe most in the region.

The first blank is rocks since rocks are often crushed into small pieces by erosion and mix easily with soil in rivers. And the second blank is fertile since fertile soil and crushed up rocks still is fertile soil.

Currently, as of february 2016, an american traveling in france would be by the exchange rate. the weakness of the euro and the strength of the us dollar means that items in france cost less to an american than they otherwise would. of course, if this trend reverses and the us dollar weakens and the euro strengthens, such as was happening in early 2008, an american traveling in france would have an adverse experience because items would cost relatively more.