How are rock and minerals useful for the construcation of house​

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

How do oceanographers measure the salinity of ocean water?

What factors of japan’s geography make it necessary for it to import so many goods?