Question: Originally, the mountains in Shenandoah were very tall - about 300 million years ago, they were ~18,000 feet tall. On average, how much elevation has been lost? Need Assignment Help? You may want to tilt the image at 38 30 29.63N 79 11 6.47W to make determining elevations easier. a. ~8,000 feet b. ~13,700 feet c. ~10,900 feet d. ~14,925 feet