Answer:
The presence of iridium in concentrations higher than 100 times the normal in the Cretaceous–Paleogene (K–Pg) boundary supports the Alvarez Impact Hypothesis.
Explanation:
Father and Son Alvarez argued that since iridium is present in extremely minute quantities on earth, its presence in very high concentrations in this layer which is thought to date back to 66 million years is evidence that an extraterrestrial impact took place which brought the iridium. The high destructive nature of the impact spread the iridium far and wide which deposited on the surface which is why it is present in this layer which dates back to that period.
Answer:
to keep the environment,animals and humans healthy and not rotten
Answer:
a. Heavily cratered region
Explanation:
The face of the moon that we can see has two areas: Lunar Highlands and Maria region. The last one consists of dark areas on the side of the Moon that we can see that are made of lava from volcanoes. The Maria region has a lot of craters that have formed when meteors hit the surface.
Answer:
Brain drain is the emigration of individual who are highly proficient or qualified in their field of study .
Explanation:
Brain drain is the emigration of individual who are highly proficient or qualified in their field of study . The departure of these group of professional may be due to better living condition or higher salary.
In other words brain drain is when a country losses it talented or highly skilled or educated workers to other countries through migration. Brain drain is considered a big problem to the society because competent hands migrates to another country causing more economic hardship to the country they left. The emigrants contribute to the expertise of another country. This kind of movement occurs from a developing countries to a developed country.
The impacts of Brain drain on developing countries are numerous but it is more on the negative side.
The phenomenon has caused a harmful effect on developing countries mostly in Africa. As this talented individuals move to a developed countries they become richer and the developing countries becomes poorer. The resulting impact in developing countries are lack of innovation and industrial growth, economic instability which leads to unemployment , Political instability and loss of the country's investment in education , loss of tax revenue and shortage of skilled workers.
The positive impact is that the workers from developing countries tend to improve in skills . Another benefits is remittance; this skilled workers from developing countries might send money home and this might stimulate the economy.
Answer:
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