(a) CO₂(s) ⇌ CO₂(g) is an example of sublimation.
<em>Sublimation</em> is the conversion of a <em>solid directly to a gas</em> without going through the liquid phase.
Answer: 0.125mg americium
Half-lives is a set of duration when a sample will become half of their original mass. In this case, the initial mass is 1mg and the sample is going for 3 times half-lives. Then the calculation would be: 1mg

= 1/8 mg= 0.125mg.
Answer:
C. Pangaea contained all of Earth's continental crust.
Explanation:
Pangaea is the name given to the supercontinent that contained almost all of the landmass on Earth. The remaining area was ocean.