1  2  3  4 

1  _  _  _  _

2  _  _  _  _

3  _  _  _  _

4  _  _  _  _


ACROSS
1)  a ridge of sand created by the wind; found in deserts or near lakes and oceans
2)  a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood
3)  a small hard fruit
4)  an impudent or insolent rejoinder


DOWN
1)  god of the underworld; counterpart of greek pluto
2)  the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics
3)  a negative
4)  either extremity of something that has length

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dune
iron
seed
sass