The main difference between ponds and lakes is that ponds a. are inland bodies of water b. do not develop self-contained ecosystems c. are smaller than lakes d. have easily observed currents

I believe its the answer A.

The main difference between ponds and lakes is that ponds are C.smaller than lakes Both bodies of water are enclosed by a land in which no inflow and outflow of water are observed. Herein are also developing elf-contained ecosystems. 

The form that the information for a map is store is by satellite image 

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