Answer: is constant
Explanation:
In order to analyze the velocity of the stars within a galaxy, the <u>galaxy rotation curves</u> (developed by the American astronomer Vera Rubin) are used. These graphs are elaborated as a scatter diagram in which the orbital velocity of the stars present in a galaxy is represented on the Y axis and the distance of these stars to the center of the galaxy on the X axis.
Thanks to this diagram, it has been possible to observe a characteristic behavior in the rotation speed of the stars (and gas) present in the galaxies, which differs from the rules of the orbital movement of the planetary systems postulated by Newton and Kepler.
This means that in these galaxy rotation curves it has been observed that the rotation speed of stars and gas is "constant", regardless of the distance to the center of the galaxy. This discrepancy and these results were then used to demonstrate the existence of dark matter in the universe.
Answer:
If jobs are scarce in your locality, with layoffs occurring and home ownership put in jeopardy, values fall. Like a domino effect, fewer people can afford to buy a house. Owners lower their prices to compete in a diminished market.
Answer:
Quartz is not pure in this rock.
Explanation:
When quartz shows effervescence in contact with an acid, it means that it is not in its pure state, but rather related to other substances that may be cementing the quartz. This effectiveness is caused by substances that do not react like quartz, such as calcite.
In this case, we can conclude that in relation to the calcium-rich rock shown in the question above, the calcium is not pure, but it is likely to be related to calcite, or other material that does not react to acid.
Answer:
I’m not sure, but I think flooding makes the most sense?
Answer:
b. may happen as regression brings rock closer to the Earth's surface.
Explanation:
The term metamorphism when applied to geology refers to the changes that occur between rocks that allow them to form into different rocks over a cycle. Within this process, there is a type of metamorphism known as retrograde metamorphism, which occurs when there is a regression that brings rocks close to the surface and promotes a decrease in temperature and pressure.