When a light bulb is turned on the electric current in the filament causes the filament to become hot and glow if the filament is surrounded by a gas describe how thermal energy is transferred from filament to the air outside the bulb
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the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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c. heat from the poles back down towards the equator.