Peneplain is a region that is almost a plain. It is formed due to erosion by rivers and rain, that continues until almost all the elevated portions are worn down; the most resistant rocks generally stand above the general level of the land. When a peneplain is raised, it becomes a Plateau, that is ..
Paleontology is the science dealing with extinct organisms, of her animal or plant origin, whose remains are found buried in the rocks; the study of Fossils. The term is applied only to the study of animal fossils (palaeozoology), the study of plant fossils being termed palaeobotany.
Nevados are the cold winds blowing down from the mountains with regularity in the higher valleys of Ecuador. They are produced by the cooling of the air on the mountains, partly by nocturnal radiation, and partly by contact with snow and ice, the cold air flowing down the slopes.
Rare Earths are the elements with atomic numbers from 57 to 71, of atomic weight 138.92 to 175.0, from lanthanum to lutetium. Their minerals and their compounds are difficult to separate.
The longitudinal profile or long profile of a river is a section showing its slope from source to mouth; Initially it is irregular, with rapids and waterfalls in the upper reaches, but later it becomes much smoother. The section then takes the form of a curve, much flattened towards the mouth, with the concavity upwards. ..