Black Diamonds from Outer Space Fill the blanks 3

Black Diamonds from Outer Space Fill the blanks 3

Black Diamonds from Outer Space Fill blanks 3

An …………….. of diamond may have come to Earth from outer space, scientists say. Called carbonado or “black” diamonds, the ……………. stones are …………..  Brazil and the Central African Republic. They are unusual for being the color of charcoal and full of frothy bubbles.

The diamonds, which can …………… at more than 3,600 carats, can also have a face that looks like melted glass. Because of they’re………………, the diamonds are …………….. as gemstones. But they do have …………………. and were used in the drill bits that helped …………… the Panama Canal.

Now a team led by Stephen Haggerty of Florida International University in Miami has presented a new study ……………..that the odd stones were brought to Earth by an asteroid billions of years ago.The findings were published online in the journal Astrophysical Journal Letters on December 20.

The scientists exposed polished pieces of carbonado to ………………………………. The test ………………. the presence of many hydrogens–carbon bonds, ………………. that the diamonds probably …………………….. a hydrogen-rich environment— such as that found in space. The diamonds probably formed in a hydrogen-rich environment -such as that found in meteorites. “They’re not …………………,” Haggerty said, “but they’re very similar.”

Astrophysicists, he added, have ………………………… that nanodiamonds form easily in the Titanic stellar explosions called supernovas, which scatter ………………… through ………………… space.

 

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An exotic type of diamond may have come to Earth from outer space, scientists say. Called carbonado or “black” diamonds, the mysterious stones are found in Brazil and the Central African Republic. They are unusual for being the color of charcoal and full of frothy bubbles.

The diamonds, which can weigh in at more than 3,600 carats, can also have a face that looks like melted glass. Because of their odd appearance, the diamonds are unsuitable as gemstones. But they do have industrial applications and were used in the drill bits that helped dig the Panama Canal.

Now a team led by Stephen Haggerty of Florida International University in Miami has presented a new study suggesting that the odd stones were brought to Earth by an asteroid billions of years ago.The findings were published online in the journal Astrophysical Journal Letters on December 20.

The scientists exposed polished pieces of carbonado to extremely intense infrared light. The test revealed the presence of many hydrogens–carbon bonds, indicating that the diamonds probably formed in a hydrogen-rich environment— such as that found in space. The diamonds probably formed in a hydrogen-rich environment -such as that found in meteorites. “They’re not identical,” Haggerty said, “but they’re very similar.”

Astrophysicists, he added, have developed theories predicting that nanodiamonds form easily in the Titanic stellar explosions called supernovas, which scatter debris through interstellar space.

The deposits in the Central African Republic and Brazil, he said probably come from the impact of a diamond-rich asteroid billions of years ago, when South America and Africa were joined.

Online Practice, Fill the blanks, PTE Reading exercise 1

Online Practice of Fill the blanks for PTE Reading task

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