The reason glaciers are melting are because of man-made factors. Green house gas, emissions and aerosols are good examples of what man made factors are melting earths glaciers.
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C. Lights in a house are turned off when not in use.
Earth's rotation causes day time and night time. When the earth is tilted towards the sun, the area tilted towards the sun receives more radiation, and is probably in summer/spring. When the earth is tiled away from the sun, the area tilted away receives less sunlight, so it is probably in fall/winter.