challenging, /ˈtʃæ lɪn dʒɪŋ/, earth, /ɝːθ/, planet, /ˈplænɪt/, scientist, /ˈsaɪ ən tɪst/, believe, /bɪˈliːv/, billion, /ˈbɪljən/, however, /ˌhaʊˈevɚ/, mountain, /ˈmaʊn tən/, hill, /hɪl/, forest, /ˈfɔːrɪst/, prefer, /prɪˈfɝː/, desert, /ˈdezɚt/, valley, /ˈvæli/, understand, /ˌʌndɚˈstænd /, ocean, /ˈəʊ ʃən/, volcano, /vɒlˈkeɪ nəʊ/, rainforest, /ˈreɪn fɔːrɪst/, change, /tʃeɪndʒ/, earthquake, /ˈɝːθ kweɪk/, wind, /wɪnd/, belong to, /bɪˈlɑːŋ/, own, /əʊn/, glacier, /ˈɡleɪsiɚ/, island, /ˈaɪ lənd/, storm, /stɔːrm/

UNIT2. OUR CHANGING PLANET

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