They both have an iron core, and they have the same density.
Mercury
No, Mars.
Mercury is the smallest planet closest to the earth.
Mercury is a terrestrial planet, meaning it is a rocky planet like Earth. It is the smallest and innermost planet in our solar system.
venus
the mercury relates to the planet earth
In natural light, Mercury is grayish, much like the earth's moon.
It can be sometimes, but Venus can be closer than Mercury ever can; Mercury is only the closest planet to Earth when Venus is on the opposite side of the Sun from Mercury and Earth, and maybe not even then (depending on exactly where Mars is).
Mercury doesn't have the atmosphere like Earth's and, it's to dry on Mercury, so, it's impossible for Mercury to have storms
The planet that has red dust is Mars. The planet Mercury has a surface that is a little like the moon of Earth.
Mercury
Yes, it is. Mercury is first from the sun, Earth is third.