Final answer:
Most chemical sediments are precipitated from seawater, as the evaporation of ocean water leaves behind dissolved minerals that form sediments which can accumulate and eventually become sedimentary rocks.
Step-by-step explanation:
Most chemical sediments, such as salts, are precipitated from seawater. This occurs when water evaporates from the ocean's surface, increasing the concentration of dissolved minerals until they can no longer remain in solution and precipitate out to form sediments. Over time, these sediments can accumulate and eventually form sedimentary rock. This process, where water containing dissolved salts evaporates, leaving behind solid mineral forms, is crucial in the formation of evaporites like halite (rock salt) from salt lakes or limestone from the sea bottom.
Other bodies of water like lakes, streams, and groundwater can also contribute to the formation of chemical sediments, although the vast majority are precipitated from seawater due to the global scale and significant salt content found in the oceans.