Which is not correct regarding the Arctic?
◦ Regional warming has thinned the polar ice cap's continental glacier by 3 m since 1970.
◦ Almost half of the pack ice has disappeared since 1970.
◦ Arctic pack ice is made up of both frozen fresh water and frozen salt water.
◦ Icebergs during the Pleistocene may have been 300 m (1000 ft.) tall and 700 m (2300 ft.) deep.