Huan made a chart to study for an exam about radio waves. A 2-column table with 1 row. Column 1 is labeled X with entries Changes the frequency of a wave; Is used by cell phones to transmit data. Column 2 is labeled Y with entries Changes the height of a wave; Is used by television stations for pictures.

Which headings best complete the chart?

X: Phase
Y: Pulse
X: Pulse
Y: Phase
X: AM
Y: FM
X: FM
Y: AM

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 !