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Logic Of Natural Sciences Through Historical Approach: Science For 5-6 Graders

Figure 7: The iron cycle, the work of a 7th-grader. The yellow, red, and blue signs indicate that the substance belongs to the iron, copper, and sulfur cycle, respectively

The iron cycle, the work of a 7th-grader. The yellow, red, and blue signs indicate that the substance belongs to the iron, copper, and sulfur cycle, respectively
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