Question

The four planets closest to the Sun have similar compositions (rock/metal), and all have solid surfaces. They are therefore grouped together as terrestrial ("Earth-like") planets. Even though they formed from the same process of accretion in the Solar Nebula, you'll see here that their surfaces are significantly different from one another.
Why are these planets so different? To answer this, we must start with an understanding of the processes that cause planetary surfaces to change: volcanism, tectonics, erosion, and impacts.

Answer 1

Answer: the differences among these planets  are:

Mercury:  is the closest to the Sun,have numerous craters produced by impacts.  

Venus:  its atmosphere catches the heat and causes very high temperatures.  It has great volcanic activity and mountains.

Earth: has mountains, valleys, volcanoes. It also has underwater mountains.  Their tectonic plates form their continents.

Mars: its red color is due to oxidation and corrosion of its surface. It has mountains, volcanoes, craters. Their craters are due to the great impacts of meteors.

Explanation: I hope I have helped.