... 65, 66, 68–69, 122underground 78–79valleys and gorges 70–71roads 118, 119, 122rock 75, 94– 95 cycle 58 59 igneous 42–43metamorphic 56 57 Moon rock 14sedimentary 50 51 strata 54 55 weathering ... 20, 80–81seasons 92seawater 65, 80sediment 50 , 54 , 59 , 71, 76transportation and deposition 48–49sedimentary rocks 50 51 , 54 , 59 seismograph 28shale 50 , 57 , 59 shanty towns 120sharks 100shingle ... one.TROPICS The hot regions to the north and south of the equator, between the Tropic of Cancer and the Tropic of Capricorn.TROPOSPHERE The lowest layer of the Earth s atmosphere.TSUNAMIA fast-moving...