Answer:
absolute brightness
Explanation:
The observational fact about a cepheid variable star that leads to a measurement of its distance from earth is that its period of variation is directly related to its absolute brightness
clean water supply and improved technology
The growth of port cities in Southeast Asia brought lot of new immigrants from China and India.
Explanation:
The European colonialism was spread out around much of the world. Southeast Asia too was conquered and colonized for certain period of time. The Europeans had big interest in this region because of its excellent strategic location, as well as because it was rich in multiple resources. Once the Europeans managed to gain full control over Southeast Asia they started to develop the port cities, which led to their rapid growth and became very attractive for the people to move in.
- Lot of people saw the port cities as good places where they can find opportunities to prosper, so there was large scale migration toward them.
- The migration toward the port cities was not just from the interior of the region, but also From other places, such as China and India.
- While lot of people migrated in these places willingly, some were actually brought by the Europeans as labor force.
- The number of Chinese and Indians was so large, that some areas became dominated by them, or in some regions they were the largest minority groups.
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Green house effect is the trapping of heat by some gases ! mainly in our earth this is increasing due to CO2 !
