To analyze the hypothetical chemical situation with three incidents impacting the environment, let's consider the interactions with each sphere:
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Train Derailment: The chemicals spilling onto a highway will impact the geosphere (land), as well as the hydrosphere (if the chemicals seep into nearby water sources during the rain), and possibly the atmosphere (fumes or vapors).
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Ammonium Nitrate Explosion: The explosion and resultant debris/smoke will primarily affect the atmosphere (due to smoke and gases released) and can also affect the geosphere (land around the explosion site). Firefighting efforts may involve water, which can affect the hydrosphere.
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Acid Snow: The falling acid snow will impact the geosphere (land), and as it melts, it flows into the local river affecting the hydrosphere.
Given these incidents, the combination that is most directly affected immediately following the incident is:
geosphere, biosphere and hydrosphere
This is because both the train derailment and the acid snow contribute to effects on land and water, and now considering potential impacts on living organisms through contamination would involve the biosphere as well, especially in the context of springtime melting snow (which could impact ecosystems).
Your final answer/input selection should be: geosphere, biosphere and hydrosphere.