I gotta' go look that big wurd' up ... S_U_B_S_I_D_E_N_C_E
The smooth spline tool button in Track (Advanced Tab) will make cuts and fills in terrain.
subsidence [səbˈsaɪdəns ˈsʌbsɪdəns]
n
1. the act or process of subsiding or the condition of having subsided
2. (Earth Sciences / Geological Science) Geology the gradual sinking of landforms to a lower level as a result of earth movements, mining operations, etc.
Noun 1. subsidence - an abatement in intensity or degree (as in the manifestations of a disease); "his cancer is in remission"
remission, remittal
abatement, hiatus, reprieve, respite, suspension - an interruption in the intensity or amount of something
resolution - the subsidence of swelling or other signs of inflammation (especially in a lung)
2. subsidence - a gradual sinking to a lower level
settling, subsiding
sinking - a descent as through liquid (especially through water); "they still talk about the sinking of the Titanic"
3. subsidence - the sudden collapse of something into a hollow beneath it
cave in
collapse - a natural event caused by something suddenly falling down or caving in; "the roof is in danger of collapse"; "the collapse of the old star under its own gravity"