What types of sedimentary rocks are there?

What are sedimentary rocks?

Sedimentary rock, also known as sedimentary rock, is one of the three main rocks that make up the Earth's lithosphere (the other two are igneous rock and metamorphic rock). It is a rock formed by the transportation, deposition and diagenesis of other rocks and some volcanic eruptions in places that are not too deep on the earth's surface. On the earth's surface, 70% of the rocks are sedimentary rocks, but if we count the entire lithosphere from the earth's surface to a depth of 16 kilometers, sedimentary rocks only account for 5%. Sedimentary rocks mainly include limestone, sandstone, shale, etc. The minerals contained in sedimentary rocks account for 80% of the world's mineral reserves.

Types of sedimentary rocks and types of metamorphic rocks

Sedimentary rocks can be simply divided into two categories: ① Terrigenous clastic rocks are mainly produced by the weathering and erosion of terrestrial rocks. Composed of debris. It is subdivided into conglomerate, sandstone, siltstone and argillaceous rock according to particle size. ② Endoclastic rocks mainly refer to chemical rocks and bio-chemical rocks deposited in basins. Inadequately consolidated rocks can also be broken and accumulated by wind waves, storms, earthquakes and landslides to become intraclastic rocks. According to the rock-forming components, endolithic rocks are divided into aluminous rocks, iron rocks, manganese rocks, phosphorous rocks, siliceous rocks, evaporites, combustible organic rocks (lignite, coal, oil shale) and carbonate rocks ( Limestone, dolomite, etc.).

Common metamorphic rocks in actual work: schist, gneiss, marble, slate, metasandstone, metavolcanic rocks

What are the characteristics of sedimentary rocks

Sedimentary rocks are also called sedimentary rocks. During the development of the earth's crust, rock weathering and dissolved matter, biological remains, or volcanic debris and other materials were gradually deposited, compressed, and glued in situ or to low-lying areas by external forces such as water flow. It generally has a layered structure and often contains ancient fossils.

What does the "Beware of Bears" signs that are often posted on cars now mean? 5 points

"Beware of Bears" is a warning to remind people to pay attention to bears in Hokkaido, Japan. Posting it on the car is nothing more than telling others that the car owner is more powerful, be careful and stay away from the car. But now there are too many posts and there is nothing new.

The original meaning of "Beware of Bears" is this: There are two iconic animals in Hokkaido, one is the owl, and the other is the bear. You can always see these two in shops at tourist spots and resorts. In the past, there were probably enough bears in Hokkaido, so people posted "Beware of Bears" warning signs in places where bears frequented. Now, this warning slogan has become a trademark, with black characters on a yellow background, and is used on T-shirts, wine glasses and many other products, becoming a characteristic of Hokkaido.

Nowadays...many people are not clear about this and have become a typical example of Hari. Thinking of the last time a pure girl showed off wearing a T-shirt with "no underwear" written on it, here is my sincere suggestion: If you don't understand Don’t wear English words; don’t use signs whose origins you don’t know!!!

About the classification of sedimentary rocks

Conglomerate, sandstone, and shale are sedimentary rocks formed by physical sedimentation

Limestone is a sedimentary rock formed by chemical deposition. The difference between them is that their sedimentation processes are different

They are both sedimentary rock types and have no correlation. Limestone cannot be divided into conglomerate, sandstone, shale, etc. The relationship between them is parallel. The unit recommends searching for sedimentary rocks in Baidu Encyclopedia to know what is going on