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THE UNIVERSE MATTER AND ENERGY
THE STUDY OF THE EARTH 27 INDUSTRY
4 other sections not shown
alloy animals areas astronomers atmosphere atoms bilateral symmetry blast furnace blood body called carbon carbon dioxide cars celestial celestial equator celestial pole cells changes chemical chlorophyll cloud coal color constellation contains cylinder developed device earth electric electrons elements energy engineer equator example feet fuel furnace gametophyte gases Greek heat hydrogen industry insects Interlingua iron known language layer light liquid living things locomotive machine materials mathematics matter ment metal miles minerals modern mold molecules molten move muscles notochord operation organs ovary oxygen particles passes perianth period Ph.D Phylum planetesimals plants plasma plate pole pressure printing produce railroads rails rock scientific scientists shell solid space sphere sporophyte stamens stars steel structure substance surface symbols temperature theory thermosphere tion tissue tube typewriter United University vapor various weather words