Archaen Review
amorpesos
ReviewQuestions.docxWhere did much of the initial oxygen produced by photosynthesis end up?
Group of answer choices
CO2
Bonded to iron
In the atmosphere
Outside the atmosphere
Dissolved in seawater
Group of answer choices
decrease
increase
stay the same
there is no trend, it is completely irregular
The observation of this change in density of our planets supports which hypothesis about how the solar system formed?
Group of answer choices
Solar Nubula
Accretionary Wedge
Big Bang
Plate Tectonic
The Archean Earth was hot. This heat was very important in helping differentiate Earth, form early plates, and form a magnetic field. What were the primary sources of heat?
Group of answer choices
radioactive decay
meteror impact
Big Bang
Volcanic outgassing
Why was it helpful for earth to develop a magnetic sphere?
Group of answer choices
trap gasses and lead to an atmosphere
protection from solar and UV radiation
made rocks cool more quickly
helped navigate by using a compass
During the Archean, Earth develops many important features and processes, including:
Group of answer choices
an atmosphere
a magnetic field
plate tectonics
primitive life
hydrologic cycle
crust (rather than a molten surface)
By about 1.8 Ga, we see evidence of an oxygen-rich atmosphere. Prior to that, however, there was very little oxygen present. What evidence exists for an oxygen-poor atmosphere?
Group of answer choices
lack of carbonate rocks, which couldn't precipitate because of acidic conditions
dark, rather and red colored rocks, resulting from unoxidized iron
few to no photosynthentic organisms
crust comprised of tonalite gneiss
stoney meteorites
What were the likely sources of oxygen in Earth's early atmosphere?
Group of answer choices
photochemical dissociation
photosynthesis
subduction
banded iron formations
The closest Archean-aged rocks to Virginia lie within which Province?
Group of answer choices
Superior
Wyoming
Rae
Slave
Wopmay
The earliest crust was of what composition?
Group of answer choices
ultramafic
mafic
intermediate
felsic
What are characteristics of the most likely earliest organisms?
Group of answer choices
hyperthermophiles
chemosynthetic
photosynthetic
The earliest fossils of organisms are considered very simple celled life called
Group of answer choices
prokaryotes
eukaryotes
autotrophes
heterotrophes
The earliest fossils are approximately ___________________ old, but the oldest evidence of life is _______________________ years old.
Group of answer choices
3.5 Ga, 3.8Ga
2.5Ga, 2.8Ga
3.2Ga, 3.5Ga
1.8Ga, 3.5Ga
