1. 2.479 × 1015kilometres
2. idk
A bonds with T and C bonds with G.
yes, for example, an earth quake while devastating can lead to the formation of a mountain or a valley. or a flood can change a landscape in such a way to make it more inhabitable for the local creatures. while natural disasters can help the ecosystem they can also be horrible for them as well.
Kinda weird. But I have no feelings over it :)