Deep within Earth's lower mantle, temperatures and pressures are high enough to synthesize unique crystalline structures. The mineral bridgmanite ______ remains unstable and rapidly decomposes when brought to the surface. Consequently, geophysicists must study this abundant substance indirectly by simulating the extreme conditions of the deep Earth in high-pressure laboratory chambers.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A, which constitutes approximately thirty-eight percent of the planet's total volume—
- —which constitutes approximately thirty-eight percent of the planet's total volume—Cevap
- C—which constitutes approximately thirty-eight percent of the planet's total volume,
- D—which constitutes approximately thirty-eight percent of the planet's total volume
Cevap
The correct choice is the option that sets off the nonessential clause 'which constitutes approximately thirty-eight percent of the planet's total volume' with matching em dashes on both sides.
The text setting off the nonessential relative clause with matching em dashes is correct because nonessential elements must be set off by matching pairs of punctuation (such as two em dashes, two commas, or two parentheses). In this sentence, the relative clause 'which constitutes approximately thirty-eight percent of the planet's total volume' is nonessential and must be separated from the main clause using matching em dashes on both sides.
Adım Adım Çözüm
Anahtar Kavram
Punctuation of Nonessential Elements
Tahmini Süre:45s