We have all noticed that if we hike from a place with low elevation and go up at a place with high elevation, that the temperature is gradually dropping, thus giving us a clue that the lower places are warmer, while the higher places are cooler. The reason for this, even though both the places with low and high elevation are located in the troposphere, thus the same atmospheric layer, is that the density of it is not the same everywhere. The troposphere has the highest density at its lowest points, and as the height increase the density decreases. Since the higher parts are less dense, that means that there are less gases, thus there are less molecules that are further apart from each other. This results in lesser absorption of heat, so this parts are cooler, while the lower parts are warmer because the troposphere is denser, there's more molecules that are also closer to each other, thus they absorb more heat.
The answer is 14 because Mesopotamia means between two Rivers and 14 is the one between two rivers
Economic development is able to continue in the absence of the resources that first drove it because:
- Countries can trade to get the resources
- Economic development allows for diversification
When a nation is unable to access the resources that made it quite successful, it can resort to buying that resource and then improving on it.
For instance, the U.K. used to produce sufficient coal but now import more than they produce.
Another way a nation can continue developing is diversification. The income gained from the resource that has now finished, will enable a nation to go into other economic activities which will continue their development.
For example, China used to export only agricultural goods but diversified into industrial.
In conclusion, a country can keep developing if their primary resource is finished thanks to trade and diversification.
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Answer:
Option: a. 200 million years ago
Explanation:
Million years ago, Earth had one supercontinent called Pangaea and surrounded by an ocean (Panthalassa). Alfred Wegener proposed the concept of one big continent after putting together different records of confirmation. He was able to give his theory by examining fossils of plants, trees, animals, and reptiles that found in different continents. About 200 million years ago, the supercontinent began to split up into two parts; Gondwana from Laurasia. Today's countries, including Africa, Antarctica, India, South America, and Australia are part of Gondwana, where Europe and North America from Laurasia.
