Answer:
d) Chemical composition of its outer regions
Explanation:
Spectroscopy is the study of spectral lines, it's an important part of studying the chemistry that goes on in stars and interstellar clouds, spectral lines can give relevant information because every atom or molecule gives off light at a specific frequency, thus, astronomers can look for gas containing a particular atom or molecule by tuning the telescope to one of the gas's characteristic frequencies. Therefore, we can know the chemical composition or a star's outer regions analyzing the spectral lines.
Even though the spectral shape of a blackbody continuum depends on the temperature of the object an there's a relationship between an object’s temperature and the peak of its spectrum, we don't consider this answer as correct because we are not measuring spectral lines but the continuum.
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Answer:
Explanation:
Seabed landformscan be defined as:
A wide assortment of landforms made by topographical procedure are found on the ocean floor. The landforms reveal to us how the seabed is shaped, and what sedimentation procedures are dynamic today.
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The development of large farms has polluted the river through waste runoff.
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Answer:
Apartheid was an official policy of racial segregation in South Africa from 1948 to 1994. Although racial segregation and discrimination arose earlier, after the 1948 general election, people were divided into classes by law: black, white, colored, and Asian. People of different skin colors who had lived together so far were separated, and two infrastructures were set up in the country, one for whites and the other for blacks.
This situation was clearly similar to that of the racial segregation that took place in the southern United States from the end of the Civil War until the 1960s, through which the Democratic governments of the southern states segregated African-American populations from their territories, relegating them to a citizenship of inferior conditions, with worse public services and a general lack of rights compared to those of whites.
