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L’AMBIENTE FISICO  Per metà montagna, per metà pianura

Circa la metà del territorio lombardo è costituita da rilievi
A nord si incontrano le Alpi, Lepontine, Retiche e Orobie
le Alpi raggiungono la quota massima di circa 4.000 m nell'imponente massiccio del Bernina
nell'imponente massiccio del Bernina e nel gruppo dell'Ortles, al confine con il Trentino, si estendono i principali ghiacciai delle Alpi lombarde
A sud della catena alpina, ma senza interruzione, si distendono le Prealpi
La fascia più meridionale delle Prealpi è costituita da colline, che si raccordano con la pianura
La Lombardia comprende anche una piccolissima porzione di Appennino, nell'Oltrepò Pavese
La pianura si divide tradizionalmente in "alta", formata da materiali grossolani e quindi molto permeabile e "bassa", costituita invece da sedimenti più fini
Al confine tra le "due pianure" l'acqua sotterranea, incontrando una barriera compatta, è costretta a risalire fino a sgorgare dal terreno, dando origine al fenomeno delle risorgive e dei fontanili
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