Ice Block Avalanche Jul 5, 2018 Marko ⋅ NASA POTD, Space ⋅ NASA Pictures ⋅ No comments One of the most actively changing areas on Mars are the steep edges of the North Polar layered deposits. Like 0 Thanks! You've already liked this 14 views Leave a Reply CancelYou must be logged in to post a comment. This site uses Akismet to reduce spam. Learn how your comment data is processed.