Rock is a solid aggregate with stable shape, which is composed of one or more minerals and natural glass. Rocks made of minerals are called monazites, such as marble made of calcite and quartzite made of quartz.
Rocks composed of several minerals are called composite rocks, such as granite composed of syenite, feldspar and mica, gabbro composed of basic plagioclase and pyroxene, etc. Liquids without a certain shape, such as oil, natural gas and loose sediment, are not rocks.
Rock is one of the materials that make up the earth's crust and the main component of the earth's lithosphere. Among them, feldspar is the most important rock-forming component in the crust, accounting for 60%, and it is the second most abundant ore in time.
According to their genesis, structure and chemical composition, most rocks contain silicon dioxide (SiO2), and 74.3% of the crust composition is the latter. The content of silicon in rocks is one of the important factors that determine the properties of rocks.
Rock is an important source of tools for early human beings, which is of great significance in human evolution. Therefore, the first period of human civilization is called the Stone Age. Rock has always been an important material and tool for human life and production.
Citation interpretation
1, the stone on the tall; Big stone.
"Historical Records Biography of Gaozu": "Gaozu doubts himself and hides in the rocks of Mangdang Mountain."
During the Southern Dynasties, Liang Jiangyan wrote a letter to King Yi Jianping: "On it, hide in the chapter and lie under the rock."
Chen Kangqi's Prequel to the Qing Dynasty (Volume III): "Suzhou Canglang Pavilion-the beautiful stone and Shui Mu-is the highest scenic spot in the city."
Yang Mo's Song of Youth, Part I, Chapter 3: "The next morning, she was awakened by the sound of waves beating against the rocks."
2. Metaphorical etiquette.
The poem Xiaoya Festival Nanshan: "Festival Nanshan is a poem. Hehe, Teacher Yin, the people have a vision. "
Song Ceng Gong's "Enlightening with the Servants of Beijing and Korea": "If you avoid being bothered by the machine, you should hope that Shi Jiu will return to your clothes."