Terrestrial planet from the original solar nebula. The Solar System has four terrestrial planets: Mercury, Venus, Earth, and Mars. Only one terrestrial planet, Earth, is known to have an active hydrosphere. During the formation of the Solar System, there were probably many more terrestrial planetesimals, but most merged with or were ejected by the four terrestrial planets. Dwarf planets, such as Ceres, Pluto and Eris, and small Solar System bodies are similar to terrestrial planets in the fact that they do have a solid surface, but are, on average, composed of more icy materials (Ceres, Pluto and Eris have densities of 2.17,
Sustain Our Planet a variety of energy and sustainability assessments that determine the energy usage and carbon emissions generated as a result of current and future business activities. Sustain Our Planet works with businesses to calculate, track, and reduce their carbon footprint. In 2009 Sustain Our Planet launched its Carbon Impact Assessment which analyzes energy usage and the overall environmental impact of a client’s business operations. This includes the calculation and analysis of the business' carbon footprint that is broken down by energy use, business miles driven, and company air travel. The Carbon Impact Assessment is a comprehensive report that includes a detailed