An old iron battery was discarded in this meadow. the iron in the battery is undergoing a change as it rusts. the rusting is changing the battery's color from black to orange.

a) physical
b) chemical
c) environmental
d) none of these changes are occurring

i just want the answer.

If a stone with an original velocity of 0 is falling from a ledgeand takes 8 seconds to hoybthe ground whays the final velocity of the stone

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th

Which component of the earth’s atmosphere is decreased due to photosynthesis?