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5 Written questions

5 Matching questions

  1. trilobite
  2. body fossil
  3. petrified fossil
  4. absolute age
  5. extinct
  1. a actual creatures or parts of them from the past (bones, whole insects in amber, wooly mammoths in ice, etc.)
  2. b ocean animal now extinct; used to be very common arthropod; used as index fossil
  3. c specific age of rock or fossil; example - rock layer A is 25 myo; figured out by radioactive dating
  4. d gone forever; examples - dinosaurs, trilobites
  5. e living thing dies and body / parts slowly replaced by minerals; example - logs, bones, shells

5 Multiple choice questions

  1. volcanic lava layer on surface (igneous rock)
  2. animals without backbone; earliest animals; examples - jellyfish, worms, clams, snails, insects
  3. older layers = lower; younger layers = upper
  4. first living things on earth; similar to bacteria
  5. layer eroded away , then new layers formed above; missing part of fossil record

5 True/False questions

  1. intrusionvolcanic lava layer on surface (igneous rock)


  2. half-lifetime for half # of radioactive atoms to change (decay) into different type of atoms


  3. epochslongest amounts of geologic time


  4. mass extinctiongone forever; examples - dinosaurs, trilobites


  5. radioactive decayone element changes over time to another element; gives off energy; used to figure out how old rocks/fossils are