978aa106_nd_Information_Services_Center__Description
[Concept] Youthfulness of Topography [Alternatives] In stable tectonic areas, extensive landscapes of Tertiary, or even Mesozoic, age are preserved. [Description] 
Most of the Earth´s topography is no older than Pleistocene.
Chapter 1 — GES DISC - Goddard Earth Sciences Data and Information Services Center
Description