I'm pretty sure it's to Prepare the form for the N-400 application for naturalization
<span> 210 million licensed drivers</span>
Conveniently, lovely, there.
Answer:The four inner planets -- Mercury, Venus, Earth and Mars -- share several features in common. Astronomers call them the “terrestrial planets” because they have solid, rocky surfaces roughly similar to desert and mountainous areas on the earth.
I hope this helped!