Why does the author describe the atoms that make up water? A. to give an example of a specific molecule
B. to show how liquids are different from solids
C. to explain why water is so abundant
D. to illustrate how simple chemistry is

I posted the text for context

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.