In and electric circuit, where do the electrons come from that flow in the circuit

What is the order of the moon, earth, and sun in a lunar eclipse and a solar eclipse?

J. j. thomson’s experiment disproved the theory that an atom

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k