What does the ricardian theory state? countries should produce all goods and services if they can countries should not produce goods and services that minimize opportunity costs countries should import goods and services if they are cheaper in other countries countries should export all goods and services if they make a profit

I believe the second to last one is correct and its Richardian not Ricardian. okay so Richardian Theory onh international trade is basicaly like this. lets say country A produces product X and specializes in producing product Y and country B also produces product Y but specializes in producing product X. so these countries would trade because one country needs the other product and so forth. erm i dunno if this helps

Sorry i don’t know the answer myself

which of the following is a subsurface event that takes place during the rock cycle?

  cementing  erosion  melting  weathering