This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.

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Step 1: Identify the natural sources for Nitrogen (N). Nitrogen's primary natural source is the atmosphere, where it exists as dinitrogen gas.
Step 2: Identify the natural sources for Phosphorus (P). Phosphorus is mainly found in phosphate rocks, such as fluoroapatite ().
Step 3: Identify the natural sources for Oxygen (O). Oxygen is abundant in the atmosphere as diatomic oxygen gas () and is also a major component of water () and many minerals in the Earth's crust.
Step 4: Identify the natural sources for Sulfur (S). Sulfur occurs naturally as elemental sulfur deposits, in sulfide ores (e.g., galena, sphalerite), and in sulfate minerals (e.g., gypsum).
Step 5: Identify the natural sources for Chlorine (Cl). Chlorine is primarily found in sea salt (sodium chloride, ), rock salt deposits, and brine wells.
The main natural sources are:
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This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.