Uit de Encyclopædia Britannica:
Division I. Atoms: Atomic Nuclei and Elementary Particles
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111. The Structure and Properties of Atoms
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112. The Atomic Nucleus and Elementary Particles
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121. Chemical Elements: Periodic Variation in Their Properties
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122. Chemical Compounds: Molecular Structure and Chemical Bonding
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124. Heat, Thermodynamics, and the Nonsolid States of Matter
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126. Mechanics of Particles, Rigid Bodies, and Deformable Bodies: Elasticity, Vibrations, and Flow
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Division III. The Universe: Galaxies, Stars, the Solar System
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Division I. The Earth's Properties, Structure, and Composition
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212. The Earth's Physical Properties
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213. The Structure and Composition of the Earth's Interior
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214. The Earth's Constituent Minerals and Rocks
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Division II. The Earth's Envelope: Its Atmosphere and Hydrosphere
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222. The Hydrosphere: the Oceans, Freshwater Bodies, and Ice Masses
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