:l
which principle states that rock layers with the same unique grouping of fossils are of the same geologic age?
a\\ fossil correlation
b\\ fossil superposition
c\\ faunal succession
d\\ fossil horizontality

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.