# Sun's tidal force on Earth

My question is regarding effect of Sun's gravity on earth. I want to know that if Sun's gravity can change Earth's landscape in long duration (i.e. billion of years) or not? Means if earth is dead planet and all other planets are not present in the solar system and Earth is as near as Sun as mercury currently orbiting. And also suppose Earth's surface is not smooth (because of hitting with other small bodies at regular interval) then can Earth's surface can be smooth in long duration by gravity of Sun or not?

if ... all other planets are not present in the solar system and earth is as

• @BillN In a sense, it is tidally locked with a 3 rotations to 2 orbits. It is because of the elliptical orbit that keeps it from being locked like the moon. Mercury is gravitationally locked and rotates in a way that is unique in the Solar System. As seen relative to the fixed stars, it rotates on its axis exactly three times for every two revolutions it makes around the Sun. - en.wikipedia.org/wiki/Mercury_(planet) – LDC3 Sep 25 '15 at 1:50