The united states is going to see a big population growth compared to japan and other countries because alot of immigration is happening both legally and illegally to the united states and will see a population surge of more than 5 billion population growth within 2 years
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:
At some point in the not-so-distant future, whites will become the racial minority in the United States. Why is that so terrifying to some of us — why must we see it as a win-lose? Black culture, tempered in the fires of slavery and Jim Crow and by myriad forms of rural and urban, Southern and Northern, discrimination, has deeply enriched our national life. In the face of repeated exclusion and abuse, Blacks have chosen to keep faith with the core promises of our Constitution. Their leaders, like the late John Lewis, are therefore in a position to make what Lewis called “good trouble” — holding our collective feet ever closer to the fire of our professed principles. Ms. Gorman will be of legal age to run for president in 2033. If I’m still around, I would joyfully vote to put myself in her capable hands.
Explanation:
Answer:
geographers seek to understand where things are found, why they are there, and how they develop and change over time, also examining how human culture interacts with the environment, and they way locations and places can or have an impact on people.
Initially, people's believe about the ocean floor was that it is mostly flat, and that it has little to no distinguishing features. This was proven wrong when sonar was used to map the ocean floor by <span>German scientists in the early </span>20th century, and they observed that the ocean floor is varied and it showcases such distinguishing features as atolls, submarine canyons, and mid-ocean ridges.
