Approximately how much of earth's surface is covered by water

Which theory suggested that the earth was once a signle supercontient that gradually that broke up into the contients that we know today

Suggest two reasons why irrigation is important for human development of the desert

[ou.01]which of these is the most likely use of an electromagnetic wave which has wavelength shorter than microwaves but longer than visible light? o heat food safely o neat food safely o take images of bones and teeth o transmit radio and cellular phone signals o take images of bones and teeth o transmit radio and cellular phone signals o detect the location of objects which emit heat