User: The greenhouse effect is a result of A. absorption and radiation of energy in the hydrosphere. B. consumption of fruits and vegetables that produce a biofuel. C. absorption and radiation of energy in the atmosphere.
A principal focus or focal point is a special focus: 1  For a lens, or a spherical or parabolic mirror, it is a point onto which collimated light parallel to the axis is focused. Since light can pass through a lens in either direction, a lens has two focal pointsâone on each side.
While the focus of the line chart is still change in values over time, the focus of an area chart is to highlight the magnitude of values over time. The difference is subtle, but when you need to show things like how many trees have been clear cut from 1990 to 1995 versus 2000 to 2005, the area chart really shines.