Answer:
C:Rainwater dissolves minerals out of the rocks and soil along the stream during runoff
D. I, II, and IV. Basically everything but the temperature.
A star’s spectrum will change over time due to it being dependent on some properties in the photosphere such as :
<h3>What is a Star?</h3>
This refers to an astronomical object composed of hydrogen and helium and held together by gravity. As stars age or get older, changes occur but are very slow.
This is why most stars spend their lifetime in the main sequence but does't invalidate that they won't remain constant as their constituents also become used up with time.
This is therefore the reason why star’s spectrum will change over time as the most appropriate choice.
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Answer:
Thorium-234 option a .......