Details Title: 11 and 12 Description: fuckin' bullshit Total Flash Cards: 53 Created: 04/13/2009 21:02:45		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Geology Flashcards
Cards in this set: Term what are fossils Definition remains or traces of prehistoric life Term types of fossils Definition Petrified Replacement Mold Cast Term Petrified Definition cavities and pores are filled with precipitated mineral matter Term Replacement Definition cell material is removed and replaced with mineral matter Term Mold Definition shell or other structure is buried and then dissolved by under ground water Term Cast Definition hollow space of a mold is filled with mineral matter Term Carbonization Definition organic matter becomes a thin residue of carbon Term impression Definition replica of the fossil's surgace preserved in fine-grained sediment Term Preservation in amber Definition hardened resin of ancient trees surrounds an organism Term conditions favoring preservation Definition Rapid burial Lack of oxygen Possession of hard parts Term Principle of fossil succession Definition proposed by William Smith, fossils succeed one another in a definite and determinable order Term index fossils Definition widespread geographically and existed for a short range of geologic time Term atomic structure Definition nucleus protons- positively charged Neutrons Term what orbits the nucleus Definition electrons-negative electrical charge Term Atomic Number Definition an elements identifying number, number of protons in the atoms nucleus Term Mass number Definition number of protons plus the number of neutrons in an atoms nucleus Term radioactivity Definition spontaneous breaking apart of atomic material Term Carbon-14 dating Definition half-life of only 5730 years Term true or false- carbon dating is used to dave very recent events Definition true bitch Term Precambrian era Definition 4.5 billion to 540 million years ago Term what percent of the precambrian era contains earths history Definition 88% Term precambrian rocks Definition most are buried from view each continent has a core are of precambrian rocks Term do fossil fuels come from precambrian rocks Definition negative hoe Term what is the primitive atmosphere formed from Definition volcanic gases, a process called outgassing Term water vapor condenses and forms what Definition primitive oceans as earth cools Term plants evolve and photosynthesis produces what Definition oxygen Term does oxygen content in the atmosphere increase or decrease Definition increases Term about 4 billion years after earth formed, abundant _______ ______ organisms that require oxygen existed Definition ocean dwelling Term are precambrian fossils abundant? Definition no Term plant fossils date from what period Definition the middle precambrian Term animal fossils date from what period Definition the late precambrian Term paleozoic era Definition 540 million years ago to about 248 million years ago Term what period did life forms come with hard parts Definition paleozoic era Term early paleozoic history Definition southern continent of gondwanaland exists Term North America Definition a barren lowland, seas move inland and recede several times...leaving rock salt and gypsum deposites Term early paleozoic life Definition restricted to seas, vertebrates had not yet evolved Term early paleozoic invertebrate groups Definition trilobites brachiopods cephalopods Term first organisms with hard arts, such as shells came from what era Definition early paleozoic life Term Late Paleozoic history Definition super continent of pangara forms Term worlds climate becomes very seasonal causing what Definition causing the dramatic extinction of many species Term When did that Mesozoic era happen? Definition 248-65 years ago Term What was another name for the Mesozoic era? Definition Age of dinosaurs Term During what era did Pangaea begin to to break up and form the Atlantic Ocean? Definition Mesozoic Era Term What was the dominant tree of the mesozoic era? Definition Gymnosperms (pines and cedars) Term What readily adapted to the dry Mesozoic climate? Definition Reptiles Term What was the dominate animal of the mesozoic era Definition dinosaurs Term What are thought to be the two reasons animals became extinct towards that the end of Mesozoic era? Definition asteroid struck the earth and extensive volcanism Term When did the Cenozoic era happen? Definition 65 million years ago till now Term What was another name for the cenozoic era? Definition age of mammals Term Were most of the continents above or below sea level during the cenozoic era? Definition Above Term Rivers erode and form what during the cenozoic era? Definition gorges like the grand canyon Term During the cenozoic era what plant dominated the world? Definition Angiosperms (flowering plants) Term What two groups of mammals evolved at the end of the mesozoic era? Definition Marsupials and placentals