2. Earth is different from other planets in a way that it is the only planet with liquid water on the surface. a. Earth, Venus, and Mars may have similarities: (1) They all are terrestrial planets, made of solid rocks and silicates; (2) They all have an atmosphere; (3) They all almost have the same time to rotate on their axes: (4) Earth and Mars both have water; (5) They all have carbon dioxide; and (6) All have landforms. a. Earth. Venus, and Mars have differences: (1) Venus has no water; (2) Venus and Mars don't have oxygen; and (3) Earth has life forms.