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Distances in Space 1
The Earth and Its History
Prehistoric Plants and Animals
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algae amount amphibians atoms body boiling bones burning called calories candle Centauri change to lead chemical change chemical energy color cooled crystals cycad diet digestion Dinichthys dinosaurs dry cell earth eggs electrical energy fish flame force form of energy fossils freezing fuel galaxy gases glass green plant heat energy igneous rocks inches kinds of food kinetic energy land layers of rock learned light energy light travels limewater liquid living things look magma mammals material measure distance melting Merychippus metamorphic rock miles milk Milky millions minerals molecule of water move oxidation oxygen particles physical change piece plants and animals potential energy prehistoric proteins Proxima Centauri reptiles sand scientists sedimentary rocks shells small intestine soil solid standard stars steam substance sugar surface teeth temperature trilobite tube unit of measurement uranium vibrating vitamins water vapor weight word