Rocks of western slave province nwt dated 4. 06 bya. 5th of canada land mass low relief (mean the difference in the elevation between the highest and lowes point) here it isn"t a lot difference so low relief elevation increases from east to west. 3. 5% of canada"s landmass low lying poorly drained landscape (muskeg) underlain by sedimentary rocks going back in time we see that one or more times it was covered by tropic seas arctic lands (archipelago) see page 41-42. Precambrian crystalline (igneous) rock overlain by paleozoic sedimentary rock. Ellesmere island- 225 mya to present the location of north america we see it was closer to the equator and then we see that the places shifted that"s why it has trees. When we look at figure 2. 1 in the text we are simplifying. Maximum extent of the wisconsin ice sheet it covered most of canada 18-25 years ago.