Which of the following statements best defines rocks?
Combinations of minerals and or once living things
combinations of metals and minerals
combinations of once living things only
or combinations of minerals only
From Google:
Rocks are composed of grains of minerals, which are homogeneous solids formed from a chemical compound arranged in an orderly manner. The aggregate minerals forming the rock are held together by chemical bonds.
The statement that best defines rocks is: "Combinations of minerals only." Rocks are classified as solid, naturally occurring aggregates of minerals. They are not combinations of metals and minerals or once living things.
To determine the statement that best defines rocks, we can analyze each option:
1. Combinations of minerals and/or once living things:
Rocks are typically composed of minerals, which are naturally occurring, inorganic solid substances with a specific chemical composition and crystalline structure. However, rocks can also contain organic remains, such as fossilized plant or animal material. Therefore, this statement is somewhat accurate.
2. Combinations of metals and minerals:
While minerals can contain metals, not all rocks contain substantial amounts of metals. Rocks are more commonly composed of a variety of minerals, including both metallic and non-metallic minerals. Therefore, this statement is not entirely accurate.
3. Combinations of once living things only:
Although organic remains can become incorporated in rocks, rocks are not solely comprised of once living things. Rocks primarily consist of minerals, which are non-living substances. Thus, this statement is not correct.
4. Combinations of minerals only:
Out of the given options, this statement is the closest to being completely accurate. Rocks are formed through the combination of minerals and are typically composed predominantly of minerals.
In conclusion, the statement "Combinations of minerals only" best defines rocks.