343.W/M^2 of energy is emitted by the sun to the earth. how much actually reaches the earth's surface? A. About one fourth
B. Almost all
C. About a third
D. About half

iron would move it is magnetic there is a mag field around the current in the wire

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.