No. Possums are arboreal, living in trees (and sometimes people's roofs).
no it wasn't i was just a secret code. No, the Underground Railroad was neither underground nor a railroad. It was called "underground" because slave owners could never find out how or when slaves...
yes and is often mined as a by-product of mining other metals
Possums are nocturnal creatures, coming out as darkness approaches in the evening. this varies according to the seasons.
Igneous rocks
People mostly used their own money