headward erosion
31Mesa — For other uses, see Mesa (disambiguation). The Island in the Sky mesa/district of Canyonlands National Park, as seen from the Needles district …
32human embryology — ▪ biology Introduction the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth. The human body, like that of most animals, develops from a single cell produced by the union of… …
33Martian chaos terrain — Contents 1 Chaos terrain on Mars 2 Locations 3 Theories for formation 3.1 Melting of buried ice 3.2 …
34Alaskan mountains — ▪ mountains, United States Introduction three principal mountain groups the Brooks Range, Alaska Range, and Aleutian Range found in Alaska. The mountain ranges of Alaska give their state a rugged and beautiful terrain across its entire… …
