Answer

which of the following statements is true?
a.
the earth is exactly the same as it was millions of years ago.
b.
the earth's surface has not changed over time.
c.
the earth has evolved over time.
d.
the earth's continents have not changed over time, but some islands have formed.

Why should the scientific method be used to answer a question? a. it provides a way to test an idea without any bias. b. it provides a way to test a hypothesis. c. it provides a way to ensure all hypotheses are proven correct. d. it provides a way to quickly turn a hypothesis into a scientific theory.

After cloud droplets form, what must happen to them for precipitation to occur?

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)