Answer:
sorry we can't understand this language very very sorry
The difference between alberta and vancouver is 690 kilometers
Answer:
La Paz is a bit more densely populated than Lima, since the former has a population density slightly higher than this of latter.
Explanation:
In this case, we need to know the populations and occupied area of the city. By definition, population density is the ratio of the population of the city to the occupied area in the same location.
The required information is gathered below:
La Paz (Bolivia)
Population: 1.801 million (Metropolitan area)
Occupied area: 475 square kilometers.
Population density: 3792 inhabitants per square kilometer.
Lima (Perú)
Population: 9.674 million
Occupied area: 2672 square kilometers.
Population density: 3621 inhabitants per square kilometer.
In this case, La Paz is a bit more densely populated than Lima, since the former has a population density slightly higher than this of latter.
A reef than surrounds a volcanic island is an : Atoll
Atoll usually takes shapes in a form of ring that surround the areas of volcanic island that consist of corals. It usually only exist in warm waters, so volcanic islands will provide perfect environment for the corals
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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.
