The answer is Crude birth rate
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.
Answer:
Asteroid 1997 XF11 is one mile wide.
Explanation:
The above statement is the statement that is too narrow in the passage. A "too narrow" statement is one that gives a detail of what the main passage is talking about. Also, it helps the reader to visualize a part of what the passage is talking about. Yet it does not still provide enough information for one to grasp the whole passage. Also, such statement gives a specific idea or concept from the story or passage.
The above statement is "too narrow" because it actually states a single part of the overall passage and also gives a very specific idea from the passage.
Yes, the plate tectonics can also affect how volcanoes act.
Some of the cash crops that were grown in the caribbean were sugar, tobbaco, coffee, spices, and cotton. :/
