Final answer:
The most abundant metal in the earth's crust is aluminum (option a). Aluminum is a silver-white element that is characterized by its low density, resistance to corrosion, and high strength.
Step-by-step explanation:
The most abundant metal in the earth's crust is aluminum (option a). Aluminum is a silver-white element that is characterized by its low density, resistance to corrosion, and high strength. It is used in a wide range of applications including construction, transportation, and packaging.