Read (or reread) these two paragraphs from a science course, looking for differences in how the ideas are organized and presente
d. Light
Light passes through some materials without scattering. We call objects of this kind transparent. Clear glass and clear plastic wrap are two transparent objects. Other objects, such as wax paper or frosted glass, let some light through but scatter or block the rest. These objects are translucent. Then there are opaque objects, which do not let any light through. Opaque objects block all light. Instead, they produce shadows on a surface when an object prevents light from reaching that surface. You are an opaque object. So is a wooden door, a refrigerator, or a moose.
Sound
Sound travels in waves that are produced when something vibrates. Sound waves are invisible—we cannot see the movement of sound through the air with our eyes. Unlike light, sound needs a medium, something to travel through. Sounds can move through solids like walls or clothing, liquids such as water, or gases such as air. Walls, water, and air are all examples of different media through which sound travels.
Which answer does a good job of contrasting thetwo paragraphs?
Both paragraphs use lots of familiar images to help readers imagine how energy flows through things.
One paragraph introduces and defines basic terms while the other sticks with more basic information.
Both paragraphs focus on substances that an energy form might travel through.
One paragraph is about how light travels, and the other is about how sound travels.
Objects vary in how they transmit light. Transparent objects allow light to travel through them. Materials like air, water, and clear glass are called transparent. When light encounters transparent materials, almost all of it passes directly through them. Glass, for example, is transparent to all visible light. Translucent objects allow some light to travel through them. Materials like frosted glass and some plastics are called translucent. When light strikes translucent materials, only some of the light passes through them. The light does not pass directly through the materials. It changes direction many times and is scattered as it passes through. Therefore, we cannot see clearly through them and objects on the other side of a translucent object appear fuzzy and unclear. Opaque objects block light from traveling through them. Most of the light is either reflected by the object or absorbed and converted to thermal energy. Materials such as wood, stone, and metals are opaque to visible light
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Charles C. Mann is among the most prominent America authors during the early parts of the 20th century wherein he was most famous for his work: Coming of Age in the Dawnland published in 1941. He presented his argument that the Native Americans lived in a dynamic world because they were already considered as civilised people, even before the Europeans came to the New World.
