Answer:
The correct answer is: b. intermediate- to low-mass stars (between 0.8x to 8x the mass of our Sun).
Explanation:
Once the hydrogen in the nucleus is finished, the hydrostatic equilibrium is broken, and gravity is able to overcome radiation. This causes the star's core to contract, thus increasing its internal temperature and density. Meanwhile, due to convection, the outer layers expand, so the external temperature decreases. The star increases its external size becoming what we know as the Red Giant.
By increasing the temperature in the core, the necessary conditions are given to begin to fuse Helium and convert it into Carbon. So the core is getting denser and the outer layers of the star expand even more.
The end of our star is marked by the moment when the helium in the nucleus ends. In addition, the outer layers are so far apart that they no longer exert sufficient pressure to compress the core and trigger carbon fusion. In parallel, the star is so large that the outer layers of the star escape the gravity of the star, pushed by radiation. In this way, the interstellar medium of helium, carbon and a little oxygen is enriched. Leaving behind a White Dwarf, the nucleus of the star in which Helium has become Carbon.
The population growth of Europe is decreasing.
Explanation:
Europe, as a continent, is in the worst demographic situation. It is the only continent where it is predicted that the population will be decreasing in the coming decades. In fact, the majority of the countries in Europe have minimal population growth or have decrease in their populations already.
Taken as a whole, the continent experiences decrease in the population growth. This is due to the significantly lowered birthrates, so there is less and less young population, and more and more old population, thus aging populations. Over time, there will be less and less people for reproduction, and if the current trend continue, the continent will experience sharp decline in population in few decades.
The top three countries by population growth in Europe are:
- Luxembourg (1.90)
- Cyprus (1.27)
- Ireland (1.11)
The bottom three countries with largest population decline are:
- Latvia (-1.10)
- Lithuania (-1.10)
- Moldova (-1.06)
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The percent is C.)75%
Hope This Helps.
Answer:
Read Below (2 Examples)
Explanation:
1: You can use a GPS and try to find directions to a certain place.
2: when your lost you can use it to track yourself back to your own home.
Hopes this Helps :D
