I’m carbon cycle, co2 is mainly stored in

rocks

Explanation:Google

Most of Earth's carbon—about 65,500 billion metric tons—is stored in rocks. The rest is in the ocean, atmosphere, plants, soil, and fossil fuels. Carbon flows between each reservoir in an exchange called the carbon cycle, which has slow and fast components.

multiply 2kg by latent heat of vap

that would be because of both gravity and friction. so     c