Transcript Slide 1
Geologic_Time_Test_1a – Earth Science 1) The process of matching rock layers from different locations based on the presence of the same guide (index) fossils is an example of ____________ dating. 2) How long ago was the Earth formed? 3) What does the ozone layer do to protect the life on Earth? 4) A rock formed with 1,000 atoms of a radioactive parent element, but only contains 250 radioactive parent atoms today. If the half-life is 1,000,000 years, how old is the rock? 5) What type of fossil is shown above? 6) If a sample contains 20g of an isotope that has a half life of 1000 years. How much will be left after 2000years? 7) What type of fossil is fossilized dinosaur poop? 8) What did Nebraska look like 94 MYA? 9) What was the specific name of the first organisms that did photosynthesis on Earth 3.4 BYA? 10) Which of the following radioactive isotopes is most useful for dating a very young sample (<20,000 years) of wood? rubidium-87 uranium-238 carbon-14 potassium-40 11) What Era was the Age of Trilobites in? 12) What was the event that killed off the dinosaurs? 13) What event happened between the Paleozoic and the Mesozoic? 14) Use the table of fossils to answer this question. A geologist working at another cliff section has discovered a layer of similar sedimentary rock that contains fossils Y and Z. The newly-discovered layer best correlates with layer ______________. 15) During what era was coal formed? 16) During what era did the first flowering plants appear? 17) Pangaea formed at the end of what era? 18) During what era did the first true birds appear? 19) What type of fossil is shown above? 20) How was the Moon formed? 21) During the last part of what era were the amphibians the dominant large land animal? 22) How many millions of years ago did the Earth turn into “Snowball Earth”? 23) Atoms of AA decay to atoms of BB with a half-life of 100,000 years. If there are 20,000 atoms of AA to begin with (and 0 atoms of BB), how long will it take for there to be 2,500 atoms of AA? 24) Human beings evolved during which geologic era? 25) During what era did mammals take over for dinosaurs as the dominant large land animals? 26) If a sample contains 100 g of a radioactive isotope, how much will be left after 3 half lives? 27) _________________ are remains of species that existed on Earth for relatively short periods of time, were abundant, and were widespread geographically. The can be used for relative dating. 28) What type of fossil is shown above? 29) If you start with 1000 g of Carbon 14, how much will remain after 4 half lives? 30) How old is the sample after 4 half lives?