Sedimentary rocks form from loose sediment or fragments that are cemented together and harden. Clastic sedimentary rocks have broken fragments of rocks and minerals. Chemcal sedimentary rocks are formed from a precipitate or solution usually sea-water or a lake. Halite or salt is such a rock. Organic sedimentary rocks form from animal or plant remains.
Limestone is a common organic.
Sedimentary rocks often have layers, small particles. Metamorphic rock forms from very high temperatures and pressures often deep within the earth. Students will generate written products to discover the characteristics of igneous rocks as found in the student text page 330. A Rock is a mixture of one or more minerals. Rocks can also contain mineraloids, glass or organic particles of various sorts.