article_snippet.sent: Scientists believe the bizarre network of ridges formed in Mars' wet past billions of years ago above the now eroded, much softer bedrock.
article_snippet.sent: Scientists believe the bizarre formed in Mars' wet past billions of years ago above the now eroded bedrock .
article_snippet.sent: It seems that the two-toned minerals were created from two distinctive wet periods on the planet.
highlights_snippet.sent: They formed in Mars' watery past above the now eroded, softer bedrock .
  
highlights_snippet.sent: Two-toned minerals were created from two wet periods on the red planet .