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.
A pinch point is a reminder. It's a reminder of who the antagonist is and what is at stake. Further, this reminder isn't filtered by the hero's experience. In other words, it's not just how the hero sees the antagonist, or antagonistic force, this is how they are. Here we see their true nature.