One of my 7th grade Science students found these in her horse trough and we can't figure out what they are.
http://www.csd49.org/cms/classpages/...ing_thing1.jpg
http://www.csd49.org/cms/classpages/...ing_thing2.jpg
When cut open their insides were white and pasty. After a while though the white substance turned very black.
Does anyone know what these are?
Thanks.:D