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ESS 301 MIDTERM EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
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ESS 301 MIDTERM EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE How do we define the ancient coastline of North America, and what does this indicate ? respect to the ratio of two isotopes of strontium present in magma which has risen through the crust. This indicates wh...

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  • November 7, 2024
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  • 2024/2025
  • Exam (elaborations)
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ESS 301 MIDTERM EXAM QUESTIONS AND ANSWERS

WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE

How do we define the ancient coastline of North America, and what does this

indicate ?

respect to the ratio of two isotopes of strontium present

in magma which has risen through the crust. This indicates whether the underlying crust

is old and continental

or young and oceanic. We're primarily interested in the recent arrivals, but there's also

the Belt Group.

What is the The Belt Rocks (NW Montana), and what does it include

70,000 ft (about 13 miles) of monotonous sedimentary rocks, slightly

metamorphosed. They include fine sandstones, red mudstones, and "dirty" limestones

and range in age from

1.7 Ga to 800 Ma, resting on Archaean basement rock (2.3 to 2.8 Ga). All have been

metamorphosed.

Where was the Belt sediment deposited, and what kind of water landscape and

climate is included in this region.

- deposited in a broad, shallow expanse of water, perhaps an arm of the sea,

surrounded

on at least two sides by dry land (maybe a failed rift).

, - This was relatively still water surrounded by a gentle

landscape of thick, lifeless soils.

- The climate was generally hot and humid

What are more characteristics of the Belt Group

-They contain no volcanic deposits (no evidence of nearby active plate boundaries)

-no sand dunes (warm

everywhere on the planet, so a relatively stagnant atmosphere), even though they span

a range of 800 Ma.

They

- also show no evidence of bioturbation, so sedimentary structures are well preserved.

What are some of the Atmospheric effects of the belt group?

The atmosphere had enough oxygen to cause oxidation of some sediments and was

rich in carbon dioxide,

producing a greenhouse environment, with nothing but algae to take advantage of it

(which they did).

what is occurring when, abundant algae growth is producing more oxygen

the atmosphere and simultaneously sequestered a lot of

the carbon dioxide, setting the stage for more complex life but also plunging the planet

into a colder climate.

This would have been self-reinforcing in the absence of anything to eat the living and/or

dead algae, giving us

the icehouse effect and a snowball Earth.

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