PT144.S4.Q19 > Question

SECTION 1 · rc

PASSAGE 1

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

PASSAGE 2

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

PASSAGE 4

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

SECTION 2 · lr

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SECTION 3 · lr

SECTION 4 · lr

Western Australian researchers have discovered microdiamonds, the oldest fragments of the Earth’s early crust yet identified. These microscopic crystals were formed 4.2 billion years ago, only 300 million years after the formation of the Earth itself. This discovery sheds light on how long it took for Earth’s crust to form.

Earth’s crust did not take longer than 300 million years to begin to form.

Must be true. We know this because the microdiamonds that researchers found were part of the Earth’s early crust. If the microdiamonds existed 300 million years after Earth itself was formed, then Earth’s crust must have taken no longer than 300 million years to begin to form.

Could be false. To claim this is where the Earth’s crust first formed is too extreme. We know that the microdiamonds the researchers found are the oldest fragments found to date. It is possible there exist older fragments that have not yet been found and that these fragments are not in what is now Western Australia.

Must be false. We know the microdiamonds the researchers found were part of Earth’s early crust, and these existed only 300 million years after the formation of Earth.

Could be false. To claim microdiamonds were the first components is too extreme. We know that they are the oldest fragments identified to date. It is possible that older fragments exist that have not yet been identified. These other fragments might be things other than microdiamonds.

Could be false. To claim all microdiamonds were formed at this time is too extreme. It is possible that there are other naturally occurring microdiamonds that formed after the ones the researchers identified.

PrepTest 144 - Section 4 - Question 19

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