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| to dissolve out soluble constituents from ashes and soil by percolation |
| tectonic boundary where two plates are moving toward each other |
| Canadian Shield | |
| —n | |
| See shield Laurentian Shield, Also called: Laurentian Plateau (in Canada) the wide area of Precambrian rock extending west from the Labrador coast to the basin of the Mackenzie and north from the Great Lakes to Hudson Bay and the Arctic: rich in minerals | |