induration. 1. the process of hardening or being hardened.
1 They're weak against the Ice and Water types in reference of erosion, which cause this elements to the ground. 2  They're immune against the Electric type because in real life, the ground is a natural sink of electrons.  The Bug type resists them because many bugs like worms live inside the ground and many of them eat it.
For all their brutality, âyou donât have to use the best militaryâ against them because âthese people arenât that good,â the general said. But broadcasting up front an unwillingness to use ground troops in Iraq, despite an expanded mission there, creates problems, both Mattis and Crocker said.