Classificação da Biblioteca do Congresso dos E.U.A. (LCC)GB662.H66

animals(82) Antarctic(11) atmospheric(7) biology(59) California(45) chemistry(100) children(108) children's(125) climate(48) climate change(60) conservation(90) cycles(10) disasters(14) early reader(24) earth(213) easy reader(34) ecology(156) ecosystems(13) education(26) elementary(35) engineering(31) environment(315) environmental(35) environmental studies(9) environmentalism(25) environments(7) experiments(52) fish(18) fog(13) gas(13) general science(19) geography(392) geology(317) global warming(28) Grade 2(54) green(21) guidebook(21) history(228) ice age(15) iceberg(15) informational(157) informative(23) juvenile(55) juvenile non-fiction(27) kids(36) lake(11) matter(15) natural disasters(46) natural resources(24) natural science(39) nature(629) New Mexico(19) observation(10) ocean(160) oceanography(23) oceans(111) outdoors(23) photographs(43) photography(126) picture book(492) pink(11) planet(7) poetry(68) polar(14) pollution(34) ponds(18) primary(15) rain(197) reference(83) resources(14) rivers(408) science(2,351) science nonfiction(38) sea(35) snow(112) social studies(31) spring(25) storms(11) sustainability(13) travel(168) vocabulary(16) watershed(9) weather(553) winter(31)