explain the theory of plate tectonics and how they have changed earth’s surface over time. include the role of plate tectonics in the creation of landforms. << read less

The answer is oh i forgot 

Hiya! this would be resolution  good-luck!

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.