The hospital has made 'gradual' improvements in health care.
We noticed a 'gradual' change in temperature.
The population 'gradually' increased.
(..) Ends? Got any other theories? Well, the walls of this tunnel could have gently eroded... ...by water which still runs through it... ...providing a gradual break to our fall. - Kind of like a water slide. - Water slide. Okay, that's a theory. But wouldn't the water have formed (..)2008 Journey to the Center of the Earth