The second photo looks like the bedrock surface beneath the world trade center site has been exposed. This is a glacially scoured bedrock surface, which would be the natural characteristic of bedrock in much of the northeastern U.S. What does the photo show that you think is unusual?
The second photo looks like the bedrock surface beneath the world trade center site has been exposed. This is a glacially scoured bedrock surface, which would be the natural characteristic of bedrock in much of the northeastern U.S. What does the photo show that you think is unusual?