A
. retaining gases around Earth to form the atmosphere ... gravity
B. stratifying the atmosphere into layers ... gravity
C. movements of tectonic plates ... gravity & buoyancy
D. spreading of the sea floor ... gravity & buoyancy
E. deflecting cosmic rays ... <em>Earth's magnetic field</em>
varies as one over the distance squared
B. In WW2 this is what they were known as....but this is physics.