Lead is heavier and more resistant. Plastic foam is light and can easily be broken
A way to explain it is that back then all the continents were together but soon after drifted apart the were in the same place sort of put they drifted apart so that's sorta what happened. Hope that helps a little
Positively charged protons in the nucleus, hope this helps.
Answer:
Hello, Your answer is <em>B) Making observations</em>
<u><em>(Hope That Helps Your Answer)</em></u>