Explorations: Introduction to Astronomy (Arny), 6th EditionChapter 8:
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- The terrestrial (or inner) planets are Mercury, Venus, Earth, and Mars.
- These planets are comparable in size to the Earth and like it in composition, having an iron core surrounded by rocky outer layers.
- Heat left over from their formation makes their centers hot.
- The smaller objects (Mercury and Mars) have cooled more than Earth and Venus have.
- The flow of heat drives motions inside Earth and Venus.
- These motions determine the types of surface features found on these planets.
- Their original atmospheres were probably mainly carbon dioxide and nitrogen.
- Liquid water in Earth’s early atmosphere gradually removed
CO2. Green plants produced Earth’s oxygen by photosynthesis.
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