6917document1088How_do_we_know_the_Earth_is_a_sphere_powerpoint_2024_25.pptxapplication/vnd.openxmlformats-officedocument.presentationml.presentationba8c2bab3eddf8827ee4176a7ab72b72MD5111960972025-07-21 13:03:23https://data.lancashire.ac.uk/id/eprint/610/1/How_do_we_know_the_Earth_is_a_sphere_powerpoint_2024_25.pptx