About how many hours of daylight does Swiftater, Pa. have on September 23rd?

"spheres" is the name of the four subsytem

The difference(s) between the grand canyon and valles marineris is/are: (a) the grand canyon was formed by water, but valles marineris was not. (a) valles marineris is much longer than the grand canyon. (c) valles marineris is much wider than the grand canyon. (d) valles marineris has large volcanoes near it. all of the above

In the developed world, describe the changing role of women in agriculture.