Answer:
Iron cannot release energy either by fission or fusion.
Explanation:
When a high-mass star runs out of hydrogen inside its core, it starts burning helium, and then heavier elements until it reaches iron.
Nuclear fusion of iron cannot occur, because the amount of energy required for the fusion of two nuclei of iron is larger than the energy released.
Therefore, when all the lighter elements lighter than iron have already fuse together, the star cannot burn any other element, so the nuclear fusion inside the core stops and the star collapses on itself, producing a huge explosion known as supernova.
The approximate age of a star cluster where the brightest main sequence stars are G stars is 10 billion years. Generally, it takes tons of time for stars to evolve. It is also assumed that stars in a cluster are homogenous or have properties that are similar to one another. The amount of time the star remain in its stage or sequence phase is determined through its mass.
Answer:
In the aftermath of the nuclear crisis in Japan, the country engaged in a massive cleanup. It cleared tons of debris, rebuilt roadways and bridges, and demolished and cleared out damaged buildings. In the future, plans should be in place for organizing citizens in cleanup efforts, making the streets safe during cleanup, and safely disposing of debris.
In addition, public transportation and airports need to function as soon as possible after such an event. Therefore, government staff should develop disaster-recovery plans for the most vital transportation systems. Local governments also need to provide short-term and longer-term housing for those who lose their homes. Designated shelters, such as schools or other community buildings, should be made ready for this purpose. Governments also need to help people get insurance payments, loans for rebuilding, and sound advice for where to locate new homes and how to strengthen them.
The appropriate answer is b. the biosphere and the lithosphere . The biosphere represents that region of the earth occupied by living organisms. Humans are mainly responsible for the excess release of chemicals in the biosphere. Other life processes also release chemicals, processes such as respiration and photosynthesis. The lithosphere releases chemicals through processes such as weathering and volcanic activity.
Answer:
Good absorbers of longwave radiation and poor absorbers of shortwave radiation
Explanation:
Gases in the atmosphere such as carbon dioxide, water vapor, methane, nitrous oxide, ozone and some artificial chemicals such as chlorofluorocarbons absorb and re-radiate the sun's energy maintaining the Earth's temperature at around 33 degrees Celcius, this happens especially with infrared light that wants to go back to space, greenhouse gases are good at absorbing and emitting radiant energy within the thermal infrared range (range from about 700nm to 1mm), IR is considered long-wavelength radiation.
Considering this information we can assume greenhouse gases are good absorbers of longwave radiation and poor absorbers of shortwave radiation (such as UV or gamma rays)
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