What european capital has the worst traffic congestion?

Alow-pressure belt means the air is cold and dry warm and rising cold and sinking warm and moist

Acivilization exists for several hundred yeaars, developing its own language. such a civilization probably has been: a. farming corn b. suffering from a lack of contact with the outside world. c. isolated by mountains or some other physical barriers. d. starving from lack of trade.

Which layer surrounds the center of the earth? a: crust b: core c: mantle