Create a function that receives as input the value $c_{-}$critical and the

lists river$\_$name and c$\_$river.

river$\_$name: contains names of rivers

c$\_$river: contains the average pollutant concentration level of each river,

in order, listed in river$\_$name

c$\_$crit: critical pollutant concentration threshold

The function must return a list with the names of the rivers with

pollutant concentrations levels greater than c$\_$critical

For example, if river$\_$name $=["$Rojo$",$ "Violeta", "Verde"$],$ c$\_$river$=$

$[0\mathrm{.}9,4,0\mathrm{.}7],$ and c$\_$crit $=1,$ then the function must return

$["$Violeta$"].$