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The Origins of Earth and of Life
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animals atmosphere basins birds body brooding cacti camels carbon dioxide Carboniferous chemical chicks climate clouds color Colorado Plateau continental continents cool covered craters crustal deposits desert larks developed distance dunes dust earth earth's crust eggs elements energy enormous evolution falcons feet foggara fossil free oxygen geological giant ground heat highly hollow hydrogen ice ages interior lake land layer light living Mariner 9 Mars Martian mass miles million years ago molecules moon mountains nesting North observed oceans organisms oxides oxygen pebbles period photosynthesis planet Plate plateau poor-will probably produced protoatmosphere radiation rain rainfall reach regions relief deserts rivers rock rock doves rocky rotation Sahara salt sand grouse sandstorms scientists seeds shrimps solar species stones strata sun's surface survive temperature tion toads ultraviolet vast vegetation volcanoes water hole water vapor weathering white-crowned black wheatear wind zones