All of the following are negative effects caused by the construction of the aswan high dam except

a) fewer chemical fretilizers are used

b) thousands of families have been forced to relocate

c) the nile river delta have been changed

d) silt is no longer carried down river

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 ?

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.

Which layer surrounds the center of the earth? a: crust b: core c: mantle