how the rainbows form

A. PURPOSE
Explanation text is a text genre which tries to explain how a thing happens or why the thing is made, explanation text tends to explain and gives you information about a subject that you are interested in and would like to know more about, it usually used why and how something happened.

B. GENERIC STRUCTURE
1. General statement which describes or identifies the phenomenon
2. Series of statements that tell how or why the feature or process changes. Words should show cause and effect.
3. Conclusion/application sums up the explanation and talks about its applications; may also give examples
HOW RAINBOW IS FORMED?
Rainbow is one of optic phenomena that happen in the atmosphere of the earth naturally. We can see it at mountain range, or when it is cloudy, or when it is raining and rising of sun. We have to be the other side for looking. We can see it perfectly, if it is seen by standing in the high place. On the ground, we can not see perfectly, except if we are in the high place like in the air plane or standing on top of mountain. When we are looking at rainbow’s colors, we will see them that ordered of red is on the highest order, and purple is on the lowest order.
A rainbow is caused by the refraction and internal reflection of light inside rain drops, which results in the white sunlight being separated out into the color's of the rainbow. How rainbow is formed? Try to watch it when light of sun concerns a 90-degree angle mirror or a glass prism side, or surface of soap foam. We can see colors on the light. The colors of a rainbow are a continuous spectrum, not a set of discrete colors. This is where the saying "all the colors of the rainbow" comes from - there are many. However we typically only have specific words for a smaller number of colors which are part of the rainbow of colors. We normally say a rainbow has the colors red, orange, yellow, green, blue , indigo, violet. Rainbows also go into the infrared and ultraviolet, but we can't see this with our eyes. Red is more dominant than another color caused by having biggest wave between others. Therefore the red one is in the highest order and purple one is in lowest order. The light is rayed to be some wave length of light that it is seen by our eyes as red, bright red, yellow, green, blue and purple.
The rainbow is not located at a specific distance, but comes from any water droplets viewed from a certain angle relative to the sun's rays. Rainbows can be caused by many forms of airborne water. These include not only rain, but also mist, spray, and airborne dew. So, we can see the beautiful rainbow because there are some processes to be beautiful rainbow that it appears in the sky.