An unconformity can be described as which of the following? select all that apply. a.) a gap of time between rocks or layers b.) rock layers that do not contain any fossils c.) an intrusion that cuts through a rock or rock layers d.) an erosional surface separating younger strata from older rocks

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

Air masses are characterized by various properties including temperature humidity air pressure and wind speed. which of the following air masses is associated with low relative humidity and high air temperature ?

Why is the indus river so important to the people of pakistan?