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In which time period did Ancient Greek philosophers propose that all matter was composed of four fundamental substances: earth, air, water, and wind? 8000 B.C. – 1000 B.C. 1000 B.C. – 450 B.C. 300 B.C. – 1400 A.D. 1774 – 1794 A.D. Time Period 1 Time Period 2 Time Period 3 Time Period 4 Time Period 1 Time Period 2 Time Period 3 Time Period 4