This practice exercise is about space and tests your ability to deal with true, false not given questions.
Where Did Earth’s Water Come From?
The exact origin of our planet’s water, which covers about 70 percent of Earth’s surface, is still a mystery to scientists. Many researchers think that, instead of water forming at the same time as Earth, objects in the outer solar system delivered water to Earth in violent collisions shortly after its formation.
Astronomers began to wonder if clues to our water’s past may lie in the asteroid belt. This region of hundreds of thousands of asteroids orbiting between the inner and outer planets was believed by astronomers to be too close to the sun to house water, but astronomers recently found the first evidence of ice on the asteroid 24 Themis.
This discovery and others of ice on asteroids suggest that there might be far more ice in the asteroid belt than originally thought and provide another possibility for the origin of ocean water. Probes sent to explore asteroids, such as the DAWN spacecraft, in the upcoming years will reveal more about their mysterious water ice, potentially help us understand the beginnings of Earth’s water.
Do the following statements agree with the information given in passage above?
- True – if the statement agrees with the information
- False – if the statement contradicts the information
- Not Given – if there is no information on this
- 70% of the Earth is covered in water from a known source.
- Astronomers studied thousands of asteroids for signs of water.
- It was believed that asteroids did not have water because of the proximity to the sun.
- It has long been known that there was ice on the asteroid 24 Themis.
- More information will be gleaned about the ice on asteroids by dispatching probes.
Click below to reveal the answersAnswers
- Not Given
Passage from livescience.com
- collision = crash, impact, accident
- to wonder = to speculate, to question
- clue = indication, sign, evidence
- astronomer = a person who studies space and the universe
- asteroid = a kind of rock orbiting (circling, going round) the sun
- house (vb) = to contain, to store
- upcoming years = future, approaching
- gleaned = learned, collected, gathered
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