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The Cretaceous-Tertiary extinction, the most famous of all the Big Five, has been attributed to what major event that triggered the fall of the dinosaurs? an asteroid hitting the earth increased
competition from mammals rapid growth of forests on land surfaces glaciation
an asteroid hitting the earth
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Original conversation
User: The Cretaceous-Tertiary extinction, the most famous of all the Big Five, has been attributed to what major event that triggered the fall of the dinosaurs? an asteroid hitting the earth increased competition from mammals rapid growth of forests on land surfaces glaciation

Weegy: an asteroid hitting the earth
tinkermei|Points 1146|

User: When paleontologists refer to the "Big Five," to what are they referring? The five most influential organisms that have now become extinct. The five most influential mass extinctions in Earth's history. The five most influential events that have changed the surface of the earth. The five most influential inventions that have allowed them to study mass extinctions. Question #17MultipleChoice Score: The law of original horizontality states that _____. any undisturbed sequence of layered rocks has the oldest rock on the bottomsediment deposited into water will keep spreading from side to sidesediment deposited into water will settle at the bottom in flat layersall fossils are found in the oldest layers of rock Question #18TextMultipleChoice Score: UniformitarianismCatastrophismVolcanismStratigraphy suggests that Earth is young, while catastrophismmeteorologyuniformitarianismvolcanism proposes that Earth is old. Question #19TextMultipleChoice Score: In stratigraphymeteorologyuniformitarianismpaleontology you study rock strata, and in stratigraphypaleontologymeteorologyuniformitarianism you study fossils. Question #20MultipleChoice Score: Ninety-five percent of all living organisms were killed by the deadliest mass extinction in history. It is known as the _____ mass extinction. Cretaceous-TertiaryEnd TriassicPermian-TriassicLate DevonianOrdovician-Silurian Question #21MultipleChoice Score: The first life forms found on Earth were _____. bryozoansbacteriainsectsshellfish Question #22MultipleChoice Score: The last "hot house" or period of increased temperature occurred _____. during the time of the dinosaursduring the time of modern humanswhen there was no life on Earthduring the Archean Question #23MultipleChoice Score: The law that states that rock layers closest to the surface are the youngest rock is the _____. law of original horizontalitylaw of superpositionlaw of original lateral continuitylaw of gravity and oppositional forcelaw of cross-cutting relationships Question #24MultipleChoice Score: The longest interval of time is called _____. an eona periodan eraa century Question #25MultipleChoice Score: A geologist is studying layers of rock. He finds a fossil of a bony fish. According to the law of faunal and floral succession, what new type of fossil would he most likely find next, in the layers of rock above? a fossil of an amphibiana fossil of a reptilea fossil of a trylobitea fossil of a human

Weegy: KINDLY ASK UESTION ONE AT A TIME. OR TRY WEEGY PRO FOR THIS KIND OF QUESTIONS. THANK YOU
Expert answered|aisonyu|Points 172|

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Asked 5/4/2013 11:03:21 AM
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