Challenge Question:

Which planet of our Sun is described by the following paragraph?

It is the furthest from the Sun of the four, inner, terrestrial planets. Orbiting satellites sent from Earth have mapped the entire planet. The surface is dry and heavily cratered. There are several large volcanoes and some huge canyons. It is 141 million miles from the sun, its diameter is about half that of the Earth, its gravity is less than that of Earth, and it orbits the Sun in 687 Earth days. (Earth completes an orbit of the Sun every 365.26 days.)

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