In which of the compounds ch4, nh3, h2o, sih4, or h2s is δ+ for hydrogen the greatest? select the single best answer?

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Explanations:- When the covalent bond is formed between two different atoms then the more electron negative atom has and the less electron negative atom has charge.  More is the electron negativity difference, greater is the charge separation.

Looking at all the given molecules, Oxygen is most electron negative and hydrogen is less electron negative(hydrogen is more electron negative than Si). So, the best choice is .

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.