What instruments are used to measure weather variables?

Alow pressure system is formed when an air mass cools over a cool surface and sinks. true or false

Which feature of a map shows the relationship between a distance on a map and that distance on earth? key scale grid system compass rose

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.