"Looking at the Clouds to Know the Weather" is a text for which grade

Text from Volume 1 for Grade 7

"Looking at Clouds to Know the Weather" is a popular science explanatory text in Lesson 22 of Volume 1 for Grade 7 Chinese published by People's Education Press. The author is Zhu Yong_, and the reader is Zijun.

The author uses vivid and vivid language to introduce the relationship between clouds and weather in a logical sequence from two aspects: the relationship between clouds of different shapes and weather; the relationship between clouds with different brilliance and weather. In terms of structure, the whole text uses the relationship of total-part-total.

Thin clouds in the sky are often a symbol of sunny weather; while those low and thick clouds are often a harbinger of rain, wind and snow, and the weather can be judged based on various signs, although it is not very accurate, but The proverb has been passed down for generations.

Cloud formation: Clouds are visible aggregates composed of a large number of fine water droplets, ice crystals and dust suspended in the atmosphere. Since atmospheric pressure continues to decrease with increasing altitude, the air expands and cools as it rises, and the saturated water pressure also decreases. Clouds are formed when water vapor in the air reaches saturation and condenses into a large number of fine water droplets floating in the air.