Which is a unique feature of Earth?

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

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

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

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

Question

Which is a unique feature of Earth?	
 
 A.
The thick atmosphere—made mostly of carbon dioxide—absorbs solar radiation, heating up and helping make the atmosphere very hot
 
 B.
It is the smallest planet and has the shortest period of revolution around the sun.
 
 C.
The planet’s surface is covered with red, iron-oxide dust.
 
 D.
It is the only planet with permanent liquid water on its surface.

secret-ninja · Answer

Either A or D

anonymous · Answer

Does Earth have a layer of iron-oxide dust on the surface making it red? Is Earth the smallest planet? Is Earths atmosphere hot? (Some parts but not all) The answer is D, Earth is the only planet that has water on it that we know of.