Answer:
A
Explanation:
Because South America is covered in two sides, the long coast line in chile, and the other side with brazil
Answer:
The answer is D
Explanation:
an overabundance of nutrients primarily nitrogen and phosphorus which is in the water starts a process called eutrophication which makes it decrease. when the algae dies they are decomposed by bacteria. This process consumes the oxygen dissolved in the water which is needed by fish and other Aquatic Life to breathe.
It isn't C because it actually increases carbon dioxide not lower.
It isnt B because it does negatively impact aquatic vegetation but it is not beneficial for all aquatic animals
A isn't the the correct answer because eutrophication has nothing to do with sunlight into the ocean
So the only answer left which is correct is D
(I hope this helps you! have a wonderful day everyone!)
:)
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.
Nations of the world can work together to use energy more efficiently.
The correct answer is false.
