Which mountains divide russia into a european and an asian section?

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

If scientists only detect p waves in a certain layer of earths interior what does that tell us?

Agricultural practices in the united states nearly led to the extinction of the peregrine falcon during the 1950s and 60s.