Complete the notes below. Choose ONE WORD ONLY from the passage for each answer.

The importance of the huarango tree

– its roots can extend as far as 80 metres into the soil

– can access [1] deep below the surface

– was a crucial part of local inhabitants’ [2] a long time ago

– helped people to survive periods of [3]

– prevents [4] of the soil

– prevents land from becoming a [5]