Answers

2015-01-07T06:05:21+05:30
Jokulhlaups, formed by the sudden activity of melting glaciers. Also possibly Jungle. 
with N: Neck, Narrow arch
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2015-01-07T15:32:03+05:30
From N :-  NECK , NARROWS and NATURAL ARCH
from J :-   JUTLAND , JOKULHLAUPS  ( it is a landform formed by sudden melting of glaciers ( by volcanic activity)) , jungle
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