Changes

==61:7. THE CONTINUING ICE AGE==

==61:7. THE CONTINUING ICE AGE==

61:7.1 Throughout the [http://en.wikipedia.org/wiki/Ice_age glacial] period other [[activities]] were in [[progress]], but the [[action]] of the ice overshadows all other [[phenomena]] in the northern latitudes. No other [[terrestrial]] [[activity]] leaves such characteristic [[evidence]] on the [[topography]]. The distinctive boulders and [[surface]] cleavages, such as potholes, [[lakes]], displaced stone, and rock flour, are to be found in [[connection]] with no other [[phenomenon]] in [[nature]]. The ice is also [[responsible]] for those gentle swells, or [[surface]] undulations, known as [http://en.wikipedia.org/wiki/Drumlins drumlins]. And a [http://en.wikipedia.org/wiki/Glacier glacier], as it advances, displaces [[rivers]] and changes the whole [[face]] of the [[earth]]. [http://en.wikipedia.org/wiki/Glaciers Glaciers] alone leave behind them those telltale drifts—the ground, lateral, and terminal [http://en.wikipedia.org/wiki/Moraine moraines]. These drifts, particularly the ground moraines, extend from the eastern seaboard north and westward in [http://en.wikipedia.org/wiki/North_America North America] and are found in [http://en.wikipedia.org/wiki/Europe Europe] and [http://en.wikipedia.org/wiki/Siberia Siberia].

61:7.1 Throughout the [http://en.wikipedia.org/wiki/Ice_age glacial] period other [[activities]] were in [[progress]], but the [[action]] of the ice overshadows all other [[phenomena]] in the northern latitudes. No other [[terrestrial]] [[activity]] leaves such characteristic [[evidence]] on the [[topography]]. The distinctive boulders and [[surface]] cleavages, such as potholes, [[lakes]], displaced stone, and rock flour, are to be found in [[connection]] with no other [[phenomenon]] in [[nature]]. The ice is also [[responsible]] for those gentle swells, or [[surface]] undulations, known as [http://en.wikipedia.org/wiki/Drumlins drumlins]. And a [http://en.wikipedia.org/wiki/Glacier glacier], as it advances, displaces [[rivers]] and changes the whole [[Surface|face]] of the [[earth]]. [http://en.wikipedia.org/wiki/Glaciers Glaciers] alone leave behind them those telltale drifts—the ground, lateral, and terminal [http://en.wikipedia.org/wiki/Moraine moraines]. These drifts, particularly the ground moraines, extend from the eastern seaboard north and westward in [http://en.wikipedia.org/wiki/North_America North America] and are found in [http://en.wikipedia.org/wiki/Europe Europe] and [http://en.wikipedia.org/wiki/Siberia Siberia].

61:7.2 750,000 years ago the fourth ice sheet, a union of the North American central and eastern ice fields, was well on its way south; at its height it reached to southern [http://en.wikipedia.org/wiki/Illinois Illinois], displacing the [http://en.wikipedia.org/wiki/Mississippi_river Mississippi River] fifty miles to the west, and in the east it extended as far south as the [http://en.wikipedia.org/wiki/Ohio_River Ohio River] and central [http://en.wikipedia.org/wiki/Pennsylvania Pennsylvania].

61:7.2 750,000 years ago the fourth ice sheet, a union of the North American central and eastern ice fields, was well on its way south; at its height it reached to southern [http://en.wikipedia.org/wiki/Illinois Illinois], displacing the [http://en.wikipedia.org/wiki/Mississippi_river Mississippi River] fifty miles to the west, and in the east it extended as far south as the [http://en.wikipedia.org/wiki/Ohio_River Ohio River] and central [http://en.wikipedia.org/wiki/Pennsylvania Pennsylvania].

61:7.10 This is the [http://en.wikipedia.org/wiki/Glacier glacier] that sent forth the many tongues, or ice lobes, which carved out the present-day [[lakes]], great and small. During its retreat the North American system of [http://en.wikipedia.org/wiki/Great_Lakes Great Lakes] was produced. And [[Urantia]]n [[geologists]] have very accurately deduced the various [[stages]] of this [[development]] and have correctly surmised that these bodies of [[water]] did, at different times, empty first into the [http://en.wikipedia.org/wiki/Mississippi_river Mississippi valley], then eastward into the [http://en.wikipedia.org/wiki/Hudson_river Hudson valley], and finally by a northern route into the [http://en.wikipedia.org/wiki/St._Lawrence_River St. Lawrence]. It is thirty-seven thousand years since the connected [http://en.wikipedia.org/wiki/Great_Lakes Great Lakes] system began to empty out over the present [http://en.wikipedia.org/wiki/Niagara_Escarpment Niagara route].

61:7.10 This is the [http://en.wikipedia.org/wiki/Glacier glacier] that sent forth the many tongues, or ice lobes, which carved out the present-day [[lakes]], great and small. During its retreat the North American system of [http://en.wikipedia.org/wiki/Great_Lakes Great Lakes] was produced. And [[Urantia]]n [[geologists]] have very accurately deduced the various [[stages]] of this [[development]] and have correctly surmised that these bodies of [[water]] did, at different times, empty first into the [http://en.wikipedia.org/wiki/Mississippi_river Mississippi valley], then eastward into the [http://en.wikipedia.org/wiki/Hudson_river Hudson valley], and finally by a northern route into the [http://en.wikipedia.org/wiki/St._Lawrence_River St. Lawrence]. It is thirty-seven thousand years since the connected [http://en.wikipedia.org/wiki/Great_Lakes Great Lakes] system began to empty out over the present [http://en.wikipedia.org/wiki/Niagara_Escarpment Niagara route].

61:7.11 100,000 years ago, during the retreat of the last [http://en.wikipedia.org/wiki/Glacier glacier], the vast polar [http://en.wikipedia.org/wiki/Ice _sheets ice sheets] began to [[form]], and the [[center]] of ice accumulation moved considerably northward. And as long as the polar regions continue to be covered with ice, it is hardly possible for another glacial age to occur, regardless of [[future]] land elevations or [[modification]] of [[ocean]] currents.

61:7.11 100,000 years ago, during the retreat of the last [http://en.wikipedia.org/wiki/Glacier glacier], the vast polar [http://en.wikipedia.org/wiki/Ice_sheets ice sheets] began to [[form]], and the [[center]] of ice accumulation moved considerably northward. And as long as the polar regions continue to be covered with ice, it is hardly possible for another glacial age to occur, regardless of [[future]] land elevations or [[modification]] of [[ocean]] currents.

61:7.12 This last [http://en.wikipedia.org/wiki/Glacier glacier] was one hundred thousand years advancing, and it required a like span of time to complete its northern retreat. The [http://en.wikipedia.org/wiki/Temperate_zones temperate regions] have been free from the ice for a little over fifty thousand years.

61:7.12 This last [http://en.wikipedia.org/wiki/Glacier glacier] was one hundred thousand years advancing, and it required a like span of time to complete its northern retreat. The [http://en.wikipedia.org/wiki/Temperate_zones temperate regions] have been free from the ice for a little over fifty thousand years.