Combine words with rock characters.

1,Rock [yán shí]

Interpretation: an aggregate of one or more minerals formed under various geological processes. It is the main substance that constitutes the earth's crust. According to the origin, it can be divided into magmatic rocks, sedimentary rocks and metamorphic rocks.

2. caves

Interpretation: Limestone layer is a big hole formed by years of groundwater erosion.

Step 3 make it clear

Interpretation: Also called "Qing _". Castle peak.

4.rock sheep

Interpretation: A kind of sheep with a long and narrow head, thick male horn and short and straight female horn. Hair is blue and brown, no need. Living on a high mountain, he is good at jumping and eating shrubs, branches and grass. Also known as Shiyang.

5. Rock salt

Explanation: Also called mineral salt and rock salt. Layered salts in the crust. Most of them were formed after the ancient seawater or lake dried up.