Ahydrogen fuel cell is more efficient than a combustion reaction because very little of released energy as (heat, electrical, chemical) when used at home a fuel cell eliminates the need for (oxygen, hydrogen, electcial grid)

Environmental differences within ecosystems are generally caused by

Most of the fossils found in virginia are in the coastal plain, valley, ridge, and appalachian plateau regions, best suggesting that these geographic provinces a) were once covered by seawater. b) are the oldest parts of virginia. c) have a great deal of karst topography. d) have large amounts of sedimentary rock.

Sediment layers stop lateral spreading when: they encounter a barrier they encounter an opposing current they run out of additional sedimentary material