|
16.
|
Close-up
images of Mars by the Mariner 9 probe indicated networks of
valleys that looked like the stream beds on Earth. These images also implied
that Mars once had an atmosphere that was thick enough to trap the sun's
heat. If this were true, something happened to Mars billions of years ago that
stripped away the planet's atmosphere.
This paragraph best supports the statement that
|
|
|
Mars now has little or
no atmosphere.
|
|
|
Mars once had a thicker
atmosphere than Earth does.
|
|
|
the Mariner 9 probe
took the first pictures of Mars.
|
|
|
Mars is closer to the
sun than Earth is.
|
|
|
Mars is more
mountainous than Earth is.
|
|
Answer: Option A
Explanation:
The paragraph states that Mars once had a
thick atmosphere, but that it was stripped away. The other choices, true or
not, cannot be found in the passage.
