1. What happens to the 18O value in marine planktonic carbonate shells as water

Question

1. What happens to the 18O value in marine planktonic carbonate shells as water temperature cools?

Decreases

Unchanged

Increases

Which color in the image above represents the approximate direction of the 18O-Temperature relationship for ice cores and CaCO3 shells from a marine sediment core? Select the two correct answers from the choices below.

(mutiple solution)

purple=ice core

black=ice core

black=marine shells

red=ice core

red=marine shells

purple=marine shells

3.

Looking at the idealized data of 18O from planktonic and benthic shells in a marine sedimentcore (shown above), what can we say about sea surface temperature at this core location for times A & B & C?

Warmer & Colder & Warmer

Colder & Warmer & Can't say due to ice sheet change

Warmer & Colder & Can't say due to ice sheet change

Colder & Warmer & Colder

Looking at the idealized data of 18O from an ice core (shown above), what can we say about atmospheric temperature for times A & B?

Colder & Warmer

Warmer & Colder

5.  

We know fossil fuels are the source of recent carbon emissions (since 1850) because:

A. The 13C of the atmosphere is increasing

B. The 14C of the atmosphere is decreasing

C. The 13C of the atmosphere is decreasing

D. The 14C of the atmosphere is increasing

A + D

B + C

Decreases

Unchanged

Increases

Explanation / Answer

3. C. Warmer, Colder & can't say due to icesheet change.

4. B. Warmer & Colder

5. C. The 13C of the atmosphere is decreasing.

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