The earth became a rock at the beginning of its formation and became a rock after weathering. Then it becomes a meteorite, which is a stone, iron or a mixture of stone and iron, drifting in outer space without falling into the earth's atmosphere.

If it falls into the atmosphere, it will become the meteorite we usually see and will not be burned by the atmosphere. Simply put, the so-called meteorite is the debris left by a tiny asteroid "hitting the earth". Billions of years have passed, and there are countless rocks in the world. It is developing in the direction of quantification.

Extended data:

Rock characteristics:

No wonder the engineering properties of rocks are the factors of material composition (the properties of particles themselves), structure (the relationship between particles), structure (forming environment, transformation and construction) and existing environment (stress, temperature and water). If it is rock mass, it depends on both structural plane and rock mass. In most cases, the structural plane plays a controlling role.

Use of building materials:

1. Marble: Marble is fine in texture and is often used as a wall or floor. Because marble is metamorphic from limestone, the main component is calcium carbonate, so it is also the raw material for manufacturing cement.

Marble is soft and delicate, and it is a good sculpture stone. Many famous statues are made of marble, such as the famous statue of Venus. Others, such as walls or decorations, are usually made of marble, such as vases, ashtrays, tables and other household items.

2. Granite: The local granite can only be seen in Kinmen, so almost all the old houses in Kinmen are granite. Granite used in temples in Taiwan Province Province, which comes from Fujian, is mostly used for dragon pillars, floor tiles and stone lions in temples.

3. Slate: Because slate is easy to crack into thin plates and easy to obtain in mountainous areas, the aborigines still use slate as building materials to build slate houses or fences.

4. Conglomerate: Some conglomerates contain pebbles and sand, with poor cementation and easy dispersion. For example, this kind of conglomerate is found in the Quaternary Touji mountain layer in western Taiwan, in which pebbles and sand are building materials.

5. Limestone: The most common limestone in Taiwan Province Province is formed by coral, commonly known as coral reef limestone. In Penghu, coral reef stones, commonly known as "stones", are used as wall building materials by residents to keep out the strong northeast monsoon and protect crops.

6. Mudstone: Because its main component is clay, it has been used as raw material for making bricks and ceramics since ancient times.

7. Andesite: Because of its hard material, it is often used as the dragon pillar, stone carving, tombstone and floor tile of the temple.

Baidu Encyclopedia-Rock and Roll