The answer is; When the planet is at A it is moving faster than at B.
This is because when the planet is closer to the sun at point A, it is experiencing a stronger gravitation, by the sun, pull than at point B. Therefore, its acceleration due to gravity at point A is higher than at point B.
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To have an overall positive or negative charge. (as opposed to neutral one)
A layer of ice on the surface keeps the water temperature warmer than the air temperature.
Rusting ability because it is something you can see