Copper is listed in the 29th position in the periodic table. it’s used for conducting electricity. what is copper?

Identify the electromagnets with poles that are reversed from the electromagnet shown above

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit

Need what is special about water as a compound? how does water regulate climate? what drives water evaporation?   why is the water vapor fresh water when it rises from the ocean? why might freshwater in the form of snow take longer to enter the water cycle again than liquid precipitation?   what is an aquifer? what role do people play in the water cycle? plz just answer as many as you can ! thx if you !