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3-It’s Natural

1-natural (adj) from nature and not made by people (nature :n, naturally :adv)

2-aurora borealis (n) coloured light that appears sometimes in the sky in the most
northern countries(syn: the Northern Lights)
3-cause (v) to make sth happen
4-affect (v) to make a change to
sb/sth

5-explorer (n) sb who travels to new places to find out about them (explore :v,
exploration :n)
6-Great Barrier Reef the largest coral reef in the world, parallel to the northeast coast of
(n) Australia
7-marine (adj) of the sea

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