"The images of Mars taken by the Mariner 9 probe indicate the presence of valleys that looks like the stream beds on Earth. The images also show that Mars once had an atmosphere that was thick enough to trap Sun's heat. If this is true, something must have happened to Mars billions of years ago that stripped away its atmosphere."This paragraph supports which of the following statements:-Mars has little or no atmosphere.Mars once had an atmosphere thicker than Earth's atmosphere.Mariner 9 probe took the first picture of Mars.Mars is closer to Sun than Earth.

A fresh satellite image of Mars collected by the Mars Reconnaissance Orbiter shows an unusual site where sediments have eroded over time and exposed an ancient channel that stretches for a few miles. The f e a has b e c more o b v as t planet h dried u , especially w h viewed f r a height o about 250 m i . The feature may reveal something about the ancient past on Mars across millions of years of the planet's history.

The planet Mars, I scarcely need remind the reader, revolves about the sun at a mean distance of 140,000,000 miles, and the light and heat it receives from the sun is barely half of that received by this world. It must be, if the nebular hypothesis has any truth, older than our world; and long before this earth ceased to be molten, life upon its surface must have begun its course. The fact that it is scarcely one seventh of the volume of the earth must have accelerated its cooling to the temperature at which life could begin. It has air and water and all that is necessary for the support of animated existence. "Yet so vain is man, and so blinded by his vanity, that no writer, up to the very end of the nineteenth century, expressed any idea that intelligent life might have developed there far, or indeed at all, beyond its earthly level. Nor was it generally understood that since Mars is older than our earth, with scarcely a quarter of the superficial area and remoter from the sun, it necessarily follows that it is not only more distant from time's beginning but nearer its end.In general, readers today have a better understanding of science than readers in 1898. How would the tone of the passage's narrator have affected readers in 1898 versus readers today?A.It would have seemed far too complicated to understand.B.It would have seemed more insulting, since the narrator seems to belittle the readers.C.It would have seemed more credible, since the narrator speaks with scientific authority.D.It would have seemed more frightening, since the narrator is so knowledgeable about science.SUBMITarrow_backPREVIOUS

Which of the following statements is not a description of Mars? Has a reddish color Has a thin atmosphere One of the rocky planets Has no moons

What is true of Mars?Group of answer choicesDefinite microfossils have been found.Its atmosphere is mostly water vapor.Iron oxide on the surface is responsible for its reddish color.A pool of water was discovered by the Mars Rover.Its magnetic field is stronger than Earth's

ad this excerpt from H. G. Wells's novel The War of the Worlds:The planet Mars, I scarcely need remind the reader, revolves about the sun at a mean distance of 140,000,000 miles, and the light and heat it receives from the sun is barely half of that received by this world. It must be, if the nebular hypothesis has any truth, older than our world; and long before this earth ceased to be molten, life upon its surface must have begun its course. The fact that it is scarcely one seventh of the volume of the earth must have accelerated its cooling to the temperature at which life could begin. It has air and water and all that is necessary for the support of animated existence.Yet so vain is man, and so blinded by his vanity, that no writer, up to the very end of the nineteenth century, expressed any idea that intelligent life might have developed there far, or indeed at all, beyond its earthly level. Nor was it generally understood that since Mars is older than our earth, with scarcely a quarter of the superficial area and remoter from the sun, it necessarily follows that it is not only more distant from time's beginning but nearer its end. The secular cooling that must someday overtake our planet has already gone far indeed with our neighbour. Its physical condition is still largely a mystery, but we know now that even in its equatorial region the midday temperature barely approaches that of our coldest winter. Its air is much more attenuated than ours, its oceans have shrunk until they cover but a third of its surface, and as its slow seasons change huge snowcaps gather and melt about either pole and periodically inundate its temperate zones. That last stage of exhaustion, which to us is still incredibly remote, has become a present-day problem for the inhabitants of Mars. The immediate pressure of necessity has brightened their intellects, enlarged their powers, and hardened their hearts. And looking across space with instruments, and intelligences such as we have scarcely dreamed of, they see, at its nearest distance only 35,000,000 of miles sunward of them, a morning star of hope, our own warmer planet, green with vegetation and grey with water, with a cloudy atmosphere eloquent of fertility, with glimpses through its drifting cloud wisps of broad stretches of populous country and narrow, navy-crowded seas.And we men, the creatures who inhabit this earth, must be to them at least as alien and lowly as are the monkeys and lemurs to us. The intellectual side of man already admits that life is an incessant struggle for existence, and it would seem that this too is the belief of the minds upon Mars. Their world is far gone in its cooling and this world is still crowded with life, but crowded only with what they regard as inferior animals. To carry warfare sunward is, indeed, their only escape from the destruction that, generation after generation, creeps upon them.Which lines best contributes to the suspense built in the passage?A.The immediate pressure of necessity has brightened their intellects, enlarged their powers, and hardened their hearts.B.The secular cooling that must someday overtake our planet has already gone far indeed with our neighbour.C.It has air and water and all that is necessary for the support of animated existence.D.Its physical condition is still largely a mystery, but we know now that even in its equatorial region the midday temperature barely approaches that of our coldest winter.SUBMITarrow_backPREVIOUS