PT116.S3.Q13 > Question

SECTION 1 · rc

PASSAGE 1

Question 1 Question 2 Question 3 Question 4 Question 5

PASSAGE 2

Question 6 Question 7 Question 8 Question 9 Question 10 Question 11 Question 12 Question 13

PASSAGE 3

Question 14 Question 15 Question 16 Question 17 Question 18 Question 19 Question 20 Question 21

PASSAGE 4

Question 22 Question 23 Question 24 Question 25 Question 26 Question 27 Question 28

SECTION 2 · lr

Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8 Question 9 Question 10 Question 11 Question 12 Question 13 Question 14 Question 15 Question 16 Question 17 Question 18 Question 19 Question 20 Question 21 Question 22 Question 23 Question 24 Question 25

SECTION 3 · lr

SECTION 4 · rc

PASSAGE 1

Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

PASSAGE 2

Question 8 Question 9 Question 10 Question 11 Question 12 Question 13

PASSAGE 3

Question 14 Question 15 Question 16 Question 17 Question 18 Question 19

PASSAGE 4

Question 20 Question 21 Question 22 Question 23 Question 24 Question 25 Question 26 Question 27

Why was liquid water present back when the sun was so dim?

A hypothesis resolving this discrepancy must explain how Earth had liquid water 3.8 billion years ago. It must either identify a source of water other than the oceans or state a difference between Earth today and Earth 3.8 billion years ago that allowed the oceans to contain liquid water before the sun brightened.

This explains the presence of liquid water 3.8 billion years ago. The atmosphere held more heat back then, so the oceans were not frozen despite the dimmer sun.

This does not explain how liquid water was present in the first place. The sun only brightened about 2 billion years ago, so the presence of water 3.8 billion years ago remains a mystery.

This widens the discrepancy by suggesting the oceans were frozen until about 2 billion years ago. It does not explain the presence of liquid water 3.8 billion years ago.

This does not address the presence of liquid water 3.8 billion years ago. It implies that parts of Earth were colder than expected 2 billion years ago, but makes no mention of Earth 3.8 billion years ago.

This implies frozen oceans are likely to remain frozen and liquid oceans are likely to remain liquid, without addressing Earth 3.8 billion years ago. If the oceans were liquid back then, it remains unexplained why they were liquid.

PrepTest 116 - Section 3 - Question 13

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