Answer:
Colonization Of Africa by European countries.
Explanation:
When Europeans truned to imperalism (colonization) they dominated Africa, stripping them of their culture, forcing them to adapt to the European life.
<span>I guess there should be an options to choose. Anyway I know the answer. Here it is: If granite and marble were exposed in an area with hot and humid climate,</span> the marble would erode more rapidly.
by B he means this answer-->
many people move from the forest to areas where it is easier to make a living
Western Europe has advanced communications and transportation systems. A city in Western Europe is London.
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.
