d6dc8cf8_KS3_Ex___Earth_Science_On_Site__uitable_questions_at_this_site
[Acceptable responses] Very little, indicating chemical resistance to weathering. (Although the viaduct is a listed monument, and it may have been recently cleaned!)
The capstone has been here since 1874. What signs of weathering does it show?
MEL/KS3/Ex - Earth Science On-Site