Por que os tratados de kyoto e paris não apresentam avanços ?

According to the earth science reference tables, during which geologic time period were the continents of north america,south america, and africa closest together?

Simple astronomical telescope the objective lens has a focal length of 75 cm and that of a piece of 5cm of the lenses are 18 cm apart when will be final image of a distant object before

Can someone me? i need to have this done as soon as possible! i'm putting 20 points on this!