I believe people who practice Judaism read the Torah for guidance.
Answer:
As of 2020, there are 12 countries in South America: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Uruguay and Venezuela. French Guiana is an overseas territory of France and not an independent country.
Explanation:
Answer:
Apartheid was used by South Africa. Apartheid was a political system that was active ruing the time when the white minority ruled the country. It focused primarily on the skin color of people and discriminated non-whites. It ended in the early 1990s. Segregation existed in South Africa for a long time before the 20th century but with apartheid it became institutionalized.
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.
Hey there!
Mars is the fourth planet from the sun and has 2 moons. They are: <span>Phobos and Deimos.
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