About 3.8 billion years ago
A student buries an ice cube in a pan of dirt and observes the dirt as the ice cube melts. This activity is a model of the formation of a kettle.
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(Says I have to cite my sources so here goes: I just copy/pasted your question into Google lol)
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.