Archaen Review

Where 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

 

In general, how do the densities of planets change in our solar system, starting from the sun and moving towards Pluto?

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

ultra

mafic

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