Which of the following is an example of how pictures of a planet's surface can provide evidence about the planet's natural
resources?
oa. pictures showing clouds suggest the presence of free oxygen
ob. pictures showing rocks suggest the presence of natural gas.
oc. pictures showing craters suggest the presence of gold.
od. pictures showing valleys suggest the presence of water.
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OD

Explanation:

Pictures of valleys suggest the present of water because there are limited ways that valleys can form. Those formed in the presence of water have distinctive characteristics that differentiate them from those formed by other processes.

For example, a U-shaped valley will have been carved by a large mass of ice, so we know there is (or was) frozen water on the surface of the planet at some point. V-shaped valleys with lines that resemble veins are tributaries running into them could be active or dried up river valleys.

Other valleys are caused by wind and by geologic processes such as divergent plate boundaries and faulting, but these do not resemble those carved by water.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

personal, she chose to do it.