Why was mercury unable to retain an atmosphere during its formation?

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)