ROCKY AND INNUITIAN MOUNTAINS FORMED
PANGAEA BROKE APART
UNINHABITABLE
HUMANS ON EARTH
THIRD ERA
CANADIAN SHIELD
APPALACHIAN MOUNTAINS FORMED
LAST ICE AGE
DINOSAURS
PANGAEA FORMED
CURRENT ERA
FIRST ERA
GLACIERS CARVED LAKES
SECOND ERA
NORTH AMERICA NEAR EQUATOR
LONGEST ERA