Q 01/05
A) Third
B) Second
C) Fourth
D) Fifth
Answer · why
It is the only astronomical object known to harbor life and the only Solar System world with liquid surface water.
Q 02/05
A) 58.3%
B) 64.5%
C) 68.0%
D) 70.8%
Answer · why
The remaining 29.2% is land, mostly in the land hemisphere.
Q 03/05
A) 6 billion
B) 8 billion
C) 4.5 billion
D) 10 billion
Answer · why
It formed from gas and dust in the early Solar System, taking perhaps 70 to 100 million years.
Q 04/05
A) 25,000 km
B) 32,000 km
C) 36,000 km
D) 40,000 km
Answer · why
It is rounded into an ellipsoid and is the densest planet in the Solar System.
Q 05/05
A) Exactly 24 hours
B) About 24 hours 4 minutes
C) About 23 hours 56 minutes
D) About 25 hours
Answer · why
The solar day of 24 hours is slightly longer than this sidereal rotation.
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