Answer:
Population pyramid is used to show the changes taking place in demography of country.
Explanation:
- The population pyramid shows the demographic structure of a community. Births, deaths, and migration are three important components of population change that alter the trends in the population composition of a place.
- The main economic reason why the people under the age group of 50 are less likely to migrate to the community is due to they have good earnings and better standards of living.
- One social factor that can attract the migrants that are over the age of 65 is social linkages and cultural ties. The population of females that is vier 80 years of age is more in numbers due to they have better health conditions.
- The population pyramid can be used to show social welfare as it harnesses human capital over time.
Answer:
The US government consists of three primary branches.
1) The Legislative Branch
2) The Executive Branch
3) The Judicial Branch
This question asks us to provide the hierarchy of the executive branch. The hierarchy of the Executive Branch includes the following elements:
- The President
- The Vice President
- The Executive Office of the President
- The Cabinet
The complete hierarchy in detail is attached as an image.
Answer:
A light-year is a unit of distance.
Explanation:
Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km. More precisely, one light-year is equal to 9,500,000,000,000 kilometers.
Answer: Two hydrogen nuclei come together to produce one helium nucleus and two protons, and energy is released.
Explanation:
All stars (including the Sun) at birth begin to fuse two hydrogen nuclei to form helium through nuclear fusion.
In this sense, nuclear fusion is the union of two light atoms, releasing energy in the process, which is the cause of the great luminosity of a star. Especifically, the hydrogen nuclei will begin to fuse, generating helium nuclei in the process and releasing huge amounts of energy.
To unerstand it better:
To shine, the stars transform their hydrogen into helium by means of nuclear fusion. When at half of its life a star is without hydrogen, the nucleus becomes entirely helium and the star declines, becoming colder and brighter due to the energy generated by the nuclear reactions, then the star begins to contract.
Nevertheless, if the star is bigger, this helium will be also consumed and the nucleus transformed in Carbon, then in Oxigen, and so on. Being the last transformation Iron until the star delivers all its energy.
