Question

Which is a unique feature of Mercury?

A.
It is the only planet with permanent liquid water on its surface.

B.
It is the smallest planet and has the shortest period of revolution around the sun.

C.
The thick atmosphere—made mostly of carbon dioxide—absorbs solar radiation, heating up and helping make the atmosphere very hot.

D.
The planet’s surface is covered with red, iron-oxide dust

Answer 1

The correct answer is B. It is the smallest planet and has the shortest period of revolution around the sun. Among the 8 planets in the universe, mercury is the smallest and the closest to the sun. Because of this, mercury has a unique revolution of only 116 days, the fastest revolution among all the planets.