You have obtained a slope map of a portion of Mount St. Helens to evaluate its topography. You want to group the areas in the map as follows: gentle, steep, nearly vertical cliff, and crater. Which renderer would be ideal to use in this case?

Innovation: Tractor
Description: a powerful motor-driven vehicle with large, heavy treads, used for pulling farm machinery, other vehicles, etc
Importance: makes jobs easier for jobs originally done with oxen

Innovation: Deep Drilling
Description: a hole depth greater than ten times the diameter of the hole
Importance: Made getting materials under the soil easier

Innovation: Steel Plow
Description: used for farming to break up tough soil without soil getting stuck to it
Importance: Led to more innovations