Mineral Formation

• The correct answer is B, crystallization, the process by which atoms are arranged to form a material that has a crystal structure.

• A is not correct, as it was not a chemical reaction with oxygen.

• C is not correct because altering minerals requires extreme changes in heat and pressure.

• D is not an accurate description of the process, since it doesn’t necessarily include organic minerals.

The correct answer is the sun. For example, animals such as cows and humans produce skeletons that contain the mineral calcium phosphate. Cows and humans eat plants that used the energy of the sun to make their food through photosynthesis.

The correct answer is A, morenosite. It has a density of 2 g/cm3 , which is calculated by dividing 5 g by 2.5 cm3 , using the formula density = mass/volume.

The streak of a mineral is the color of its powder and is a way to identify different minerals.

• Hardness is judged by scratching other minerals.

• Luster is the amount of light that is reflected by the surface of the rock.

Remember that when a rock is rubbed on the ground, it leaves a streak of color behind. This is how a streak test is performed.