There is no( ) in time between the action and the reaction

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .

when the use of electricity burdens the fuse and miniarure circuit beakers and there is a possibility of a fuse then they automatically cut off the electricity supply to your homes and after you fix the problem u jzt switch it on and it continues the supply of electricity to ur homes