descending vs upslope

descending

adj
  • Moving or sloping downwards. 

  • Ordered such that each element is less than or equal to the previous element. 

  • Becoming lower in pitch. 

  • Causing a sequence to follow a descending order. 

noun
  • A descent. 

upslope

adj
  • in a direction up a slope 

noun
  • an upward slope 

adv
  • up a slope 

How often have the words descending and upslope occurred in a corpus of books? (source: Google Ngram Viewer )