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Remote sensing of the earth's surface and atmosphere may involve the use of what type of instruments?

Mount saint helen the great lakes and death valley are physical features of the earth which scientific term describes these features

Which of the following would be considered a nec code violation in regards to the installation of luminaires? a. an outdoor lighting fixture mounted to a tree b. a five-pound, 12-inch diameter light fixture supported by the screw shell of the lampholder c. florescent lay-in fixtures attached to the framing sections of a suspended ceiling with sheet-metal screws d. track lighting over a sink, 2 feet from a bathtub