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Question 4
• You find a strange fossil and are trying to determine its age. You know that it started with 80 grams of carbon. It loses half of that every 6,000 years. The fossil currently has 20 grams of carbon. Determine how old the fossil must be.
• You find a strange fossil and are trying to determine its age. You know that it started with 80 grams of carbon. It loses half of that every 6,000 years. The fossil currently has 20 grams of carbon. Determine how old the fossil must be.
12,000 years
Question 6
Which of the following represents the longest time periodPrecambrianPaleozoicMesozoicCenozoic
Question 7
What is the current accepted age of Earth?• 200 million years• 4.6 Billion years• 10 billion years• 20.5 million years
Question 8
Which of the following gases was NOT part of the Earths original atmosphere? • Water vapor• Oxygen• Nitrogen• Carbon Dioxide
Question 10
If a sample has 1000g of a radioactive isotope, how much will be left after 3 half lives?• 500g• 150g• 125g• 250g
Question 11
An undeformed sedimentary layer is __________ than the layer above and _______ than the layer below.younger ---youngeryounger --- olderolder --- youngerolder --- older
An undeformed sedimentary layer is __________ than the layer above and _______ than the layer below.
older --- younger
Question 13
What is the name for an erosion surface that separates two sets of sedimentary layers with non-parallel bedding planes?cross-beddingformationangular unconformityfault
What is the name for an erosion surface that separates two sets of sedimentary layers with non-parallel bedding planes?
angular unconformity
Question 14
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?250,000 years500,000 years1,000,000 years2,000,000 years
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?
2,000,000 years
Question 15
Which of the following will not make a fossil?decomposed organic materialplant impressions (casts)animal footprintsloose animal bones
Question 16
A nonconformity is _________ .A. a rock unit that is different than units above or below itB. a gap in the geologic record bounded below by metamorphic or igneous rocks and bounded above by sedimentary rocksC. a rock unit that does not contain fossilsD. a sequence of rocks that does not contain any gaps in the geologic record
A nonconformity is _________ .
B. a gap in the geologic record bounded below by metamorphic or igneous rocks and bounded above by sedimentary rocks
Question 19
Which of the following happened most recently?deposition of unit Cdeposition of unit Bdeposition of unit Ftilting of C,D,E, and F
Question 20
Which of the following radioactive isotopes has the longest half-life?rubidium-87potassium-40carbon-14uranium-238
Question 21
Which of the following radioactive isotopes has the shortest half-life?rubidium-87potassium-40carbon-14uranium-238
1st period winners
1: Emma, Adam, Alexis, Jackie - 52:Chloe, Lance, Mateo, David - 33: Adolfo, Charlie, Junior, Nathan - 2