As a ship crosses the Prime Meridian, an observer on the ship measures the altitude of Polaris at 60°. What
is the ship's location?

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

As water is cooled from 4 c to 0 c its density

How has the geography of india made it difficult for its people to expand before modern technology?