What do geologists think happened as the last ice age ended?A.A mass extinction occurred.B.Sea levels rose over 300 feet.C.Dense forests grew for the first time.D.Glaciers advanced worldwide.

What happened at the end of both the Mesozoic and Paleozoic eras?A.There were major asteroid impacts.B.An ice age occurred.C.A supercontinent broke up.D.There were mass extinctions.

(Q012) The Paleozoic Era ended with a mass extinction event that was likely caused byGroup of answer choicesthe formation of Pangaea.intense volcanic activity.the formation of high-latitude ice sheets.the evolution of land plants.

(Q020) Recent studies of ice agesGroup of answer choicesreveal fewer ice ages and less complexity than was originally thought.have identified paleosols that form during glacial periods.have identified glacial events by analyzing oxygen-isotope ratios in marine sediments.suggest that the entire Earth was covered by glacial ice in the Pleistocene.

(Q021) During the Pleistocene Ice Age,Group of answer choicescontinental glaciers in the northern hemisphere advanced and retreated only once.sea level rose because water was tied up as ice.the continental shelf west of Alaska was exposed and allowed migration of animals and people from Asia to North America.continental glaciers covered all of North America.

The glacial conditions persisted until the __________, which marks the end of the Ice Age and the beginning of the Holocene Epoch that we live in.