What tool was used in the past to calculate travelers’ positions on Earth

In what ways have the people of the netherlands changed the physical geography of their land

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

Write a short paragraph of about 150-300 words. explain how the physical environment can limit human activities.