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13 Aug 2026, 14:10
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In the late nineteenth century, many geologists believed that earth’s continents had moved over the course of the planet’s history, but the mechanisms behind these changes remained poorly understood. Two hypotheses have been presented to explain the movement of the continents.
Volcanic activity plays a major role in the shaping of the earth’s surface.: True
Radioactive decay plays a major role in shaping the earth’s surface.: False
The earth’s core is hotter than the earth’s surface.: True
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
54% (02:27) correct
46%
(02:45)
wrong
based on 267
sessions
History
Date
Time
Result
Not Attempted Yet
For each of the following statements, select True if, based on information in the passage, the statements indicate a point with which supporters of both hypotheses would agree. Otherwise, select False.
| True | False | |
| Volcanic activity plays a major role in the shaping of the earth’s surface. | ||
| Radioactive decay plays a major role in shaping the earth’s surface. | ||
| The earth’s core is hotter than the earth’s surface. |
ShowHide Answer
Official Answer
Volcanic activity plays a major role in the shaping of the earth’s surface.: True
Radioactive decay plays a major role in shaping the earth’s surface.: False
The earth’s core is hotter than the earth’s surface.: True
Earth’s circumference: 39,682 km — Hypothesis 2: False
Earth’s average number of earthquakes per year: 512,000 — Hypothesis 1: True
Earth’s core temperature: 4498°C — Hypothesis 1: True
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
51% (01:39) correct
49%
(01:56)
wrong
based on 283
sessions
History
Date
Time
Result
Not Attempted Yet
The following are measurements for present-day earth:
Earth’s core temperature: 4726°C
Earth’s circumference: 40,075 km
Earth’s average number of earthquakes per year: 500,000
Below, a measurement from 500 years in the future is provided, along with a hypothesis. Select true if that future measurement is consistent with the given hypothesis. Otherwise, select false.
Earth’s core temperature: 4726°C
Earth’s circumference: 40,075 km
Earth’s average number of earthquakes per year: 500,000
Below, a measurement from 500 years in the future is provided, along with a hypothesis. Select true if that future measurement is consistent with the given hypothesis. Otherwise, select false.
| True | False | |
| Earth’s circumference: 39,682 km — Hypothesis 2 | ||
| Earth’s average number of earthquakes per year: 512,000 — Hypothesis 1 | ||
| Earth’s core temperature: 4498°C — Hypothesis 1 |
ShowHide Answer
Official Answer
Earth’s circumference: 39,682 km — Hypothesis 2: False
Earth’s average number of earthquakes per year: 512,000 — Hypothesis 1: True
Earth’s core temperature: 4498°C — Hypothesis 1: True
Contradicts Hypothesis 1, but supports Hypothesis 2
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
82% (00:55) correct
18%
(00:53)
wrong
based on 244
sessions
History
Date
Time
Result
Not Attempted Yet
Assume scientists now agree that the fact that closely related animals can be found on distant continents suggests that, at some point in earth’s history, the continents were connected, forming a single, large landmass. Which of the following is an accurate description of how this fact relates to the hypotheses?
| Contradicts Hypothesis 1 and 2 | |
| Supports Hypothesis 1 and 2 | |
| Contradicts Hypothesis 1, but supports Hypothesis 2 | |
| Supports Hypothesis 1, but contradicts Hypothesis 2 | |
| Neither supports or contradicts either hypothesis |
ShowHide Answer
Official Answer
Contradicts Hypothesis 1, but supports Hypothesis 2
13 Aug 2026, 14:59
Kudos
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Statement 1: Volcanic activity playing a major role in shaping the earth's surface - both hypotheses put volcanic activity right in the mechanism. Hypothesis 1 has it as the way a shrinking planet vents material as the crust crumples, and Hypothesis 2 has it directly breaking up the original landmass into the continents we have now. Either theory you pick, volcanic activity is doing real work on the surface. True.
Statement 2: Radioactive decay shaping the earth's surface - this only shows up in Hypothesis 2, where it heats the core and drives the expansion that eventually breaks the crust apart. Hypothesis 1 never brings up radioactive decay at all, it just says the earth is cooling and contracting without explaining why. Since the passage never tells us which hypothesis is correct, and this claim only holds if Hypothesis 2 is right, it isn't something we can call true based on the two passages. False.
Statement 3: Core hotter than the surface - both hypotheses agree on this even though they disagree on almost everything else. Hypothesis 1 has a solid crust with a molten core underneath, Hypothesis 2 has a molten core wrapped in a hard shell. Molten versus solid tells you which one's hotter regardless of which theory turns out to be right. True.
So the pattern here: True, False, True. The move worth remembering for MSR true/false sets like this is checking whether a claim depends on one specific hypothesis being correct or whether it holds under both. If it only survives under one theory, you can't mark it true unless the passage tells you that theory is confirmed.
Statement 2: Radioactive decay shaping the earth's surface - this only shows up in Hypothesis 2, where it heats the core and drives the expansion that eventually breaks the crust apart. Hypothesis 1 never brings up radioactive decay at all, it just says the earth is cooling and contracting without explaining why. Since the passage never tells us which hypothesis is correct, and this claim only holds if Hypothesis 2 is right, it isn't something we can call true based on the two passages. False.
Statement 3: Core hotter than the surface - both hypotheses agree on this even though they disagree on almost everything else. Hypothesis 1 has a solid crust with a molten core underneath, Hypothesis 2 has a molten core wrapped in a hard shell. Molten versus solid tells you which one's hotter regardless of which theory turns out to be right. True.
So the pattern here: True, False, True. The move worth remembering for MSR true/false sets like this is checking whether a claim depends on one specific hypothesis being correct or whether it holds under both. If it only survives under one theory, you can't mark it true unless the passage tells you that theory is confirmed.
16 Aug 2026, 16:58
Kudos
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for statement 1-
How in hypothesis 1 is it shaping the earth's surface?
How in hypothesis 1 is it shaping the earth's surface?
ThickRiver
