Because the way that they stand and are
Answer:
B and C
Explanation:
B. In a given rock sample, the amount of Silicon-32 isotopes gets divided in half about every 170yrs.
This is the concept of half-life. Half life is the time take for half of a radioactive isotope to disintegrate. The shorter the half life the faster the isotope disintegrates.
From the question, we were told that it would take 170yrs for half of the isotope of Silicon to disintegrate to Phosphorus. This is the half life.
C. The half life can be used to determine the amount of Si-32 that has decayed from the time closure temperature was reached.
The closure temperature is very important in radioactivity. It is the temperature at which a system has cooled and there is no resulting disintegration of parent and daughter isotopes.
From first order kinetics, we know that the rate at which radioactive elements decay at any time is directly proportional to the number of radioactive atoms present. A knowledge of the half life helps to figure out the number of atoms that has decayed in time.
Streams flowing from mountainous terrain commonly flow across alluvial fans at the edges of the valleys. ... In arid and semiarid regions, seepage of water<span> from the stream can be the principal </span>source<span> of aquifer recharge.</span>
A Democracy economy the sovereignty is held by The people as a whole while In republican are as individuals. D: democratic Party
R: Republican Party
D: Free elections
R: Constitution
Contraites on the goverment: D: no:the majority can impose its will on the minority R: Yes the majority cannot take away certain inalienablerights
<h3>Questions:</h3>
Brief discussion on the annual rainfall graph?
<h3>Answer: </h3>
Climate graphs depict the typical rainfall and temperature for a certain place. A line graph depicts the temperature, while a bar graph depicts rainfall. They're frequently depicted on the same axes, with the months of the year running parallel to the base.
