Introduces what a glacier is and how it forms, discusses how and where glaciers move, presents the history of glaciers, and describes the effects of glacial erosion upon land forms.
(it; forms; ) (it; discusses; how and where glaciers move, presents the history of glaciers, and describes the effects of glacial erosion upon land forms) Context(it discusses,List([37, 56))):(how and where glaciers move; presents; the history of glaciers) (glaciers; move; )
it discusses,List([37, 56))
it it how and where glaciers move glaciers
forms discusses presents move
how and where glaciers move, presents the history of glaciers, and describes the effects of glacial erosion upon land forms
the history of glaciers