What kinds of sedimentary rocks are there?

Question 1: What is sedimentary rock? Sedimentary rocks, also known as water rocks, are one of the main rocks that constitute the earth's lithosphere (the other two are magmatic rocks and metamorphic rocks). It is a rock formed by other rocks transported, deposited and diagenetic by water or glaciers and some weathering products of volcanic eruption in a place not too deep on the surface. On the earth's surface, 70% of rocks are sedimentary rocks, but if the whole lithosphere from the earth's surface to the depth of 16 km is counted, sedimentary rocks only account for 5%. Sedimentary rocks mainly include limestone, sandstone and shale. The minerals contained in sedimentary rocks account for 80% of the world's mineral reserves.

Question 2: The types of sedimentary rocks, metamorphic rocks and sedimentary rocks can be simply divided into two categories: ① Terrigenous clastic rocks are mainly composed of various kinds of debris produced by weathering and denudation of continental rocks. According to grain size, it can be divided into conglomerate, sandstone, siltstone and argillaceous rock. Endogenous rocks mainly refer to chemical rocks and biochemical rocks deposited in the basin, or unconsolidated rocks are broken and accumulated into internal clastic rocks by wind, waves, storms, earthquakes and landslides. Endogenous rocks can be divided into aluminum rocks, iron rocks, manganese rocks, phosphorus rocks, siliceous rocks, evaporites, combustible organic rocks (lignite, coal and oil shale) and carbonate rocks (limestone, dolomite, etc.). ) according to the rock-forming composition.

Metamorphic rocks common in practical work: schist, gneiss, marble, slate, metamorphic sandstone and metamorphic volcanic rocks.

Question 3: What are the characteristics of sedimentary rocks? In the process of crustal development, weathered and dissolved rocks, biological remains or pyroclastic materials are brought to low-lying places by external forces such as in situ or water flow, and gradually deposited, compressed and cemented to form rocks. It generally has a layered structure and often contains paleontological fossils.

Question 4: What does it mean that "bear notice" is often posted on the car now? 5 points "Pay attention to bears" is to remind people to pay attention to bears in Hokkaido, Japan, and play a warning role. Sticking it on the car is nothing more than telling others that the owner is better, be careful and stay away from the car. But there are too many posts now, and there is nothing new.

The original intention of "paying attention to bears" is this: there are two kinds of symbolic animals in Hokkaido, one is an owl and the other is a bear. You can always see these two in the shops of tourist attractions and resorts all over the world. In the past, there were probably enough bears in Hokkaido, so people put up warning signs of "Bear haunt" in places where bears often haunt. Now, this warning slogan has become a trademark, with black characters on a yellow background. It has become a feature of Hokkaido in many commodities such as T-shirts and wine glasses.

Now, many people are typical of Kazakhstan and Japan because they don't know this. Remembering the last time a pure girl wore a T-shirt that said no underweart, I sincerely suggest: Don't wear English words that you don't understand; Don't use the sign that you don't know the source! ! !

Question 5: Classification of sedimentary rocks Conglomerate, sandstone and shale are all sedimentary rocks formed by physical deposition.

Limestone is a sedimentary rock formed by chemical deposition. The difference is that their precipitation is different.

They are all sedimentary rock fields, and limestone can't distinguish conglomerate, sandstone, shale and so on. Their relationship is parallel units. It is suggested to search sedimentary rocks in Baidu Encyclopedia to know what is going on.