Question

unit test: composition of the earth mid - unit test - part 1
what is a difference between coal and bauxite?
coal is inorganic, while bauxite is organic.
bauxite is a mineral, coal is not.
coal is a mineral. bauxite is organic.
coal has a crystal structure, while bauxite does not.

Explanation:

Coal is an organic sedimentary rock formed from plant - material over time. Bauxite is a mineral ore of aluminum. Minerals have a defined chemical composition and a crystalline structure. Coal is not a mineral as it is organic and has a variable composition. Bauxite is a mineral.

Answer:

B. Bauxite is a mineral, coal is not.