Mercury
* Surface: Rocky and heavily cratered. It's like the Moon, but with more extensive plains.
* Notable Features:
* Caloris Basin: A massive impact crater.
* Scarps: Giant cliffs formed by the planet's shrinking core.
* Composition: Mostly iron and nickel (metallic core) with a thin silicate crust.
Venus
* Surface: Extremely hot and covered in volcanic plains and mountains. It's perpetually shrouded in thick clouds of sulfuric acid.
* Notable Features:
* Volcanoes: Venus has many volcanoes, including the massive shield volcano, Maat Mons.
* Lava Flows: Extensive areas covered in solidified lava.
* Craters: Relatively few craters compared to Mercury or the Moon due to the thick atmosphere.
* Composition: Dense atmosphere composed mostly of carbon dioxide, which creates a runaway greenhouse effect. The surface is primarily basalt.
Earth
* Surface: Diverse with oceans, continents, mountains, valleys, ice caps, and deserts. It's the only known planet with liquid water on its surface.
* Notable Features:
* Oceans: Cover about 71% of the Earth's surface.
* Continents: Large landmasses with diverse landscapes.
* Plate Tectonics: The Earth's crust is broken into plates that move and interact, causing earthquakes, volcanoes, and mountain formation.
* Composition: A rocky surface with a diverse atmosphere, including oxygen, nitrogen, and other trace gases.
Mars
* Surface: Cold, dry, and dusty with red-colored sand and rocks due to the presence of iron oxide (rust).
* Notable Features:
* Olympus Mons: The largest volcano in the solar system.
* Valles Marineris: A vast canyon system, possibly the largest canyon in the solar system.
* Polar Ice Caps: Frozen water and carbon dioxide at the poles.
* Composition: Thin atmosphere mostly composed of carbon dioxide. The surface is primarily made of basalt, with evidence of past liquid water.
