Which one of the following statements is true? a. desert landscapes are monotonous, relatively flat areas covered to various depths with sand. b. deserts and dry lands are concentrated in areas of ascending air masses and relatively low atmospheric pressures. c. despite infrequent rainfalls, erosional and depositional features of running water are important in desert landscapes. d. rainshadow deserts occur where air masses descend after first having risen to cross a mountain range.

Can you give me little more information

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

Its in the national history museum and you can't se the original because its locked away in a vault