In general, Comets have______ orbits.
a) Elliptical
b) Highly elliptical
c) Circular
d) Parabolic (more…)
The planet that moves round the Sun at the highest speed is:
a) Jupitar
b) Venus
c) Mars
d) Mercury (more…)
During winter in cold countries, the___ is mixed to melt the ice on icy roads.
a) Salt
b) Chlorine
c) Carbon dioxide
d) Water (more…)
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