What is a multi-nation state and provide an example

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

¿cual es mas alta en baja california,la migracion o la inmigracion?

What are the answers for the following questions?