You could ask whether the black crust is a new substance formed from silver underwent a chemical change because a chemical change produces a new substance.
The answer is point C.)
Cause Ocean is a large area of salt water connected to the " ocean "
Explanation:
No. Isotopes are atoms of the same element with different atomic masses (due to the different number of neutrons)
For example, carbon exists as carbon-12 and carbon-14, which both have 6 protons but have 6 and 8 neutrons respectively.
