This is called orbiting!
For an example: "The earth is orbiting the sun!"
I hope i helped :D
-Liyah⭐
Answer:
Demographers study the growth and decline of human populations, and urban planners plan for the futures of cities (e.g. electricity, water, and transportation needs). Demographers and urban planners would benefit from working together to help solve difficult problems in society and to help plan for the future. A demographer would be very helpful to urban planners as they plan for the future of a city. For example, an urban planner would want to have an idea of the population growth in the city, or of the average growth rate in other cities, when planning for the city's future transportation, water, and electricity needs. Demographers and urban planners are important to each other! They help each other plan for the future of society
Explanation:
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.
I believe its A could be wrong sorry if i am
