ans) 1.Green House gasses 2. carbon dioxide 3.nitrious gases
So as two objects are separated from each other, the force of gravitational attraction between them also decrease. if the separation distance between 2 objects is doubled (increased by a factor of 2), then the force of gravitational attraction is decreased by a factor of 4 (2 raised to the second power).
Hope this helps :)
The implication is that tilted sedimentary layers observed to day mist have been subjected to tectonic forces