Which of the following best describes the land that became washington when it was the coast of pangea a. it was once underwater b. it was part of a vast desert c. it was mountains d. it was covered in forests how was the olympic peninsula formed? a. by subduction, which resulted in an excessive amount of volcano activity. b. through volcanic activity off the coast of washington that led to the buildup of pacific plates c. when a large chunk of the ocean floor was lifted up and attached to washington's coastline d. when shifting plates caused a large section of land to break away from washington's coast