Geology 105 Exam 1 QUESTIONS AND
ANSWERS
1. _______ thought to be the first life - ANSWER-RNA
2. ________ is the most versatile on periodic table - ANSWER-Carbon
3. 2 of the 3 domains of life in Archean - ANSWER-Bacterial and Archea
4. 3 Most Common elements in planet - ANSWER-Iron
Oxygen
Silicon
Magnesium
5. A shift in relative amounts of carbon -13 ad carbon -12 in rocks from Greenland that are
3.83 billion years old are the earliest evidence for ____________________ -
ANSWER-Possible life
6. After two half lives, ______ percent decay to daughter atoms - ANSWER-3/4
7. Age of Sedimentary Rock Layers - ANSWER-Relative Dating
Numerical Dating
8. All of the planets are orbiting the sun in the same direction and in the same plane is
called the _____________ plane - ANSWER-ecliptic
9. Alpha Decay - ANSWER-z-2
10.An exploding star is a - ANSWER-Supernova
11.Archean craton largely made of a granitic rock is called a _________ -
ANSWER-tonalite
12.Archean Eon - ANSWER-4.0 b.y.
33% of Earth's history
Late heavy bombardment ends
Continents small and growing
Iron rich oceans
Oxygen poor atmospheres
First evidence of life (Fossil)
13.Archean Eon was from _________ - ANSWER-4 to 2.5 billion
14.Beta Decay - ANSWER-z+1
15.By the end of the Archean, about _____ of present day contintental areas had formed -
ANSWER-40%
16.Chron - ANSWER-time intervals of one polarity
17.Convection - ANSWER-Warm air rising
18.Cratons - ANSWER-Oldest parts of continents
19.Earth formed from a Nebular Disk 4.6 billion years ago - ANSWER-.
20.Electron Capture - ANSWER-z-1
21.Exploding stars make all elements heavier than ______ - ANSWER-iron
22.Four Eons of Earth History - ANSWER-Hadean
Archean
ANSWERS
1. _______ thought to be the first life - ANSWER-RNA
2. ________ is the most versatile on periodic table - ANSWER-Carbon
3. 2 of the 3 domains of life in Archean - ANSWER-Bacterial and Archea
4. 3 Most Common elements in planet - ANSWER-Iron
Oxygen
Silicon
Magnesium
5. A shift in relative amounts of carbon -13 ad carbon -12 in rocks from Greenland that are
3.83 billion years old are the earliest evidence for ____________________ -
ANSWER-Possible life
6. After two half lives, ______ percent decay to daughter atoms - ANSWER-3/4
7. Age of Sedimentary Rock Layers - ANSWER-Relative Dating
Numerical Dating
8. All of the planets are orbiting the sun in the same direction and in the same plane is
called the _____________ plane - ANSWER-ecliptic
9. Alpha Decay - ANSWER-z-2
10.An exploding star is a - ANSWER-Supernova
11.Archean craton largely made of a granitic rock is called a _________ -
ANSWER-tonalite
12.Archean Eon - ANSWER-4.0 b.y.
33% of Earth's history
Late heavy bombardment ends
Continents small and growing
Iron rich oceans
Oxygen poor atmospheres
First evidence of life (Fossil)
13.Archean Eon was from _________ - ANSWER-4 to 2.5 billion
14.Beta Decay - ANSWER-z+1
15.By the end of the Archean, about _____ of present day contintental areas had formed -
ANSWER-40%
16.Chron - ANSWER-time intervals of one polarity
17.Convection - ANSWER-Warm air rising
18.Cratons - ANSWER-Oldest parts of continents
19.Earth formed from a Nebular Disk 4.6 billion years ago - ANSWER-.
20.Electron Capture - ANSWER-z-1
21.Exploding stars make all elements heavier than ______ - ANSWER-iron
22.Four Eons of Earth History - ANSWER-Hadean
Archean
