The Grand Canyon is like a history book because you can see all the layers of rock and dirt throughout the ages, and scientists can read those to tell what happened.
Hope this helped :)
For the given situation above, I think there is a lack of information regarding the one you posted. Here is what I got about the Cordillera Region.
The word Cordillera is actually a Spanish word that means mountain ranges. The climate is warm and temperate in Cordillera. Cordillera has a significant amount of rainfall during the year. This is true even for the driest month. The average annual temperature in Cordillera is 21.2 °C. The average annual rainfall is 1431 mm.
Tectonically stable means that this part of the continent has not moved for billions of years. The rock formation is important understanding the history of Earth since its unmoved and untouched state can provide ideas about how the Earth looked like as seen on the layers of the rock formation.
