In a quarter of an hour it will travel 1/4 x 90 = 22.5Km
The array of colors observed when viewing films of soap are caused by the interference, and from the reflections of light from two nearby surfaces (outer surface and inner surface). Among the choices, the closest answer would be B. reflection, refraction, and interference.
I think it’s the second one: magnetic domains must come in pairs—one north and one south
Bacteria , viruses , fungi and protozoa
