The following text is for test item 39-41. Text 1 Text 2 Rainbow is a natural phenomenon in the form of arc spectrum in the sky caused by the refraction of light. Rainbow appears after the rains. The colors are red, orange, yellow, green, blue, indigo, and violet. Rainbow is in the form like an arc. However, it actually has a circle shape. The half of the circle can be seen when we see from the higher places such as a mountain or when we are on a plane. The colors are formed as the effect of the refraction and reflection of the sunlight. After raining, the sunlight, which is the white light, touches the raindrops and it is reflected. The light will be separated in different degrees and produces different wavelengths. These wavelengths are accepted by our eyes in the form of different colors or spectrum, and we call it as a rainbow. As its position is opposite the sun, we need to turn our backs to the sun to see it. Rainbow is a natural phenomenon in the form of arc spectrum in the sky caused by the refraction of light. Rainbow appears after the rains. The colors are red, orange, yellow, green, blue, indigo, and violet. Rainbow is in the form like an arc. However, it actually has a circle shape. The half of the circle can be seen when we see from the higher places such as a mountain or when we are on a plane. The colors are formed as the effect of the refraction and reflection of the sunlight. After raining, the sunlight, which is the white light, touches the raindrops and it is reflected. The light will be separated in different degrees and produces different wavelengths. These wavelengths are accepted by our eyes in the form of different colors or spectrum, and we call it as a rainbow. As its position is opposite the sun, we need to turn our backs to the sun to see it. An aurora is a natural light display in the sky particularly in the high latitude (Arctic and Antarctic) regions, caused by the collision of energetic charged particles with atoms in the high altitude atmosphere (thermosphere). Most auroras occur in a band known as the aurora zone which is typically 3 to 6 in latitudinal extent and at all local times or longitudes. Aurora is classified as diffuse and discrete aurora. The diffuse aurora is a featureless glow in the sky which may not be visible to the naked eye even in a dark night and defines the extent of the aurora zone. Discrete aurorae are sharply defined feature within the diffuse aurora which vary in brightness from just barely visible to the naked eye to bright enough to read a newspaper at night. Discrete aurorae are usually observed only in the night sky because they are not as bright as the sunlit sky . In northern latitudes, the effect is known as the aurora borealis (or the northern lights). Its southern counterpart, the aurora australis (or the south lights), has almost identical features to the aurora borealis and changes simultaneously with the changes in the northern auroral zone and is visible from high southern latitudes in Antarctica, South America and Australia. An aurora is a natural light display in the sky particularly in the high latitude (Arctic and Antarctic) regions, caused by the collision of energetic charged particles with atoms in the high altitude atmosphere (thermosphere). Most auroras occur in a band known as the aurora zone which is typically 3 to 6 in latitudinal extent and at all local times or longitudes. Aurora is classified as diffuse and discrete aurora. The diffuse aurora is a featureless glow in the sky which may not be visible to the naked eye even in a dark night and defines the extent of the aurora zone. Discrete aurorae are sharply defined feature within the diffuse aurora which vary in brightness from just barely visible to the naked eye to bright enough to read a newspaper at night. Discrete aurorae are usually observed only in the night sky because they are not as bright as the sunlit sky . In northern latitudes, the effect is known as the aurora borealis (or the northern lights). Its southern counterpart, the aurora australis (or the south lights), has almost identical features to the aurora borealis and changes simultaneously with the changes in the northern auroral zone and is visible from high southern latitudes in Antarctica, South America and Australia. Text 1 Text 2 "Rainbow is a natural phenomenon in the form of arc spectrum in the sky caused by the refraction of light. Rainbow appears after the rains. The colors are red, orange, yellow, green, blue, indigo, and violet. Rainbow is in the form like an arc. However, it actually has a circle shape. The half of the circle can be seen when we see from the higher places such as a mountain or when we are on a plane. The colors are formed as the effect of the refraction and reflection of the sunlight. After raining, the sunlight, which is the white light, touches the raindrops and it is reflected. The light will be separated in different degrees and produces different wavelengths. These wavelengths are accepted by our eyes in the form of different colors or spectrum, and we call it as a rainbow. As its position is opposite the sun, we need to turn our backs to the sun to see it." "An aurora is a natural light display in the sky particularly in the high latitude (Arctic and Antarctic) regions, caused by the collision of energetic charged particles with atoms in the high altitude atmosphere (thermosphere). Most auroras occur in a band known as the aurora zone which is typically 3 to 6 in latitudinal extent and at all local times or longitudes. Aurora is classified as diffuse and discrete aurora. The diffuse aurora is a featureless glow in the sky which may not be visible to the naked eye even in a dark night and defines the extent of the aurora zone. Discrete aurorae are sharply defined feature within the diffuse aurora which vary in brightness from just barely visible to the naked eye to bright enough to read a newspaper at night. Discrete aurorae are usually observed only in the night sky because they are not as bright as the sunlit sky . In northern latitudes, the effect is known as the aurora borealis (or the northern lights). Its southern counterpart, the aurora australis (or the south lights), has almost identical features to the aurora borealis and changes simultaneously with the changes in the northern auroral zone and is visible from high southern latitudes in Antarctica, South America and Australia." Where do you probably find the texts? A. In someone's podcast B. In encyclopedia book C. In the recipe book D. 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