Cuesta College, San Luis Obispo, CA
Discuss why Venus' atmosphere currently has more carbon dioxide than Earth's atmosphere, even though volcanic activity on both planets outgassed the same amount of carbon dioxide. Explain using the properties of greenhouse gases and geological activity.
Solution and grading rubric:
- p:
Correct. Due to Venus being closer to the sun than Earth, Venus' oceans evaporated and this water vapor contributed to its "runaway greenhouse effect," as there is no way to reduce the carbon dioxide in its atmosphere, compared to Earth's oceans, which do manage to provide a sink for its carbon dioxide. - r:
Nearly correct (explanation weak, unclear or only nearly complete); includes extraneous/tangential information; or has minor errors. May involve plants in addition to oceans. - t:
Contains right ideas, but discussion is unclear/incomplete or contains major errors. Garbled discussion, but recognition of related factors such as distance from Sun, mass, temperature, and the greenhouse effect. - v:
Limited relevant discussion of supporting evidence of at least some merit, but in an inconsistent or unclear manner. May discuss how certain stars are fainter, or blocked by intervening matter, etc. - x:
Implementation/application of ideas, but credit given for effort rather than merit. Involving unrelated factors. - y:
Irrelevant discussion/effectively blank. - z:
Blank.
Section 70160
p: 16 students
r: 3 students
t: 9 students
v: 2 students
x: 0 students
y: 0 students
z: 0 students
A sample "p" response, illustrated (from student 1225):
Another sample illustrated "p" response (from student 0911):
A somewhat macabre illustrated "r" response (from student 1083):
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