The border between the outer core and the inner core is about 5,100 km<span> below the surface of the Earth. (The crust is usually between 3 and 70 km thick, being thicker in the continents and thinner in the oceans,)
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Answer:
Potassium argon dating
Explanation:
Potassium argon dating is a method used in determining the origin of a rock. I is done by comparing the ratio of radioactive argon to radioactive potassium in the rock. This method is used to date rocks that are thousands of million years old.
the assumptions made when using the Potassium argon dating include :
- no argon was left after formation of the rock
- no argon has either entered or escaped the sample since it was formed.
Answer:
The big number of people fleeing from Syria may have very negative demographic and economic implications for the country.
Explanation:
Syria is a country in war, both with armed forces inside and with armed forces from other countries. The war is going on for quite some time now, and it has led to the devastation of most of the country. Being afraid for their lives and seeing that there wouldn't be good conditions for living in the country for decades to come, millions of people have been on the move.
With millions of people already gone and millions trying to migrate out of the country, Syria will face a very big problem in the future. It is rapidly losing the young and middle aged population, which is the population that is able to have children and it is the population that has the biggest economic contribution. Also, the highly qualified labor force has almost entirely left the country. Apart from the sharp decline in the population, this will also result in a dramatic drop in birthrates, aging population, lack of labor force, brain drain, and the economy will suffer badly, which in turn will result in more people moving out of the country.
Answer: A. An explanation of the colors and symbols used on the map
Explanation:
