Which of these are chemical sedimentary rocks?Multiple select question.ShaleChertRock saltLimestoneGraywacke

Chemical sedimentary rocks are formed by precipitation of minerals from water. Precipitation can be caused by water evaporating or by ions reacting to form a solid. Here are the chemical sedimentary rocks from your list:

1. Chert: Chert is a chemical sedimentary rock and it is made up of very small quartz crystals. It is formed from the shells of microscopic animals or from silica that was dissolved in sea water and then precipitated out.

2. Rock salt: Rock salt is also a chemical sedimentary rock. It is formed from the evaporation of salty water such as sea water or salty lake water.

3. Limestone: Limestone is a chemical sedimentary rock that is made up of the mineral calcite. It forms in clear, warm, shallow marine waters from the accumulation of shell, coral, algal, and fecal debris.

Shale and Graywacke, on the other hand, are clastic sedimentary rocks, not chemical. They are formed from the compaction of silt, clay, and other small particles.