Which of the following is true about Neptune?
a) Its atmospheric composition and rings are most like Saturn's.
b) Its atmospheric composition is most like Saturn's, but its rings aremore like thoseof Uranus and Jupiter.
c) Its atmospheric composition is most like Uranus and its rings are likethose of Uranusand Jupiter.
d) Its atmospheric composition and its rings are most like Jupiter's.
e) It is more like the Earth than it is like any of the other giant planets.
Ans: c) Its atmospheric composition is most like Uranus and its rings are likethose of Uranusand Jupiter.
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Scientists suspect that Mars once had a global magnetic field. Assuming this is true, which of the following could explain why Mars today lacks a global magnetic field like that of Earth?
A) Mars's interior has cooled so much that its molten core layer no longer undergoes convection. B) Mars rotates much slower than the Earth. C) The Martian core is made of rock, while Earth's core is made of metal. D) Mars is too far from the Sun to have a global magnetic field.
What happens to the image in a pinhole camera if the screen is moved closer to the pinhole?
A. The image decreases in size. B. The image increases in size. C. The image remains the same size. D. The image is blurry
When the Universe was young, it was
A. denser. B. smaller and less dense. C. bigger and hotter. D. smaller and colder. E. bigger and colder.
In space there is nothing for the rocket to "push against" so how does it accelerate?
What will be an ideal response?