Question : How many planets are terrestrial planets?
Option 1: 3
Option 2: 6
Option 3: 4
Option 4: 5
Correct Answer: 4
Solution : The correct answer is 4.
The four planets that are innermost in the solar system are called terrestrial planets. In our solar system, there are four terrestrial planets. Because of their compact, rocky surfaces, which resemble Earth's terra firma, the planets Mercury, Venus, Earth and Mars are referred to as terrestrial.
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