The answer is indian ocean
First used in 1821, the Santa Fe Trail was an important trade route that connected Missouri with Mexico.
There are 550 active volcanos in the world, almost all of which are located at convergent tectonic plate boundaries. This includes all of the volcanoes in the pacific ring fire, such as Japan's mount fuji, as well as mount saint helens, popocafepeti in mexico and Azul in the Andes range.
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Answer:
I don't know what land you are referring to but land is usually fertile because it has the necessary nutrients for the plants to grow. Another reason land is fertile is because there is animal manure on or in the ground in question.
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I think that the best answer from the options is the following one:
B. lightly regulated markets depressing wages for unskilled workers
The thing is, unskilled workers cannot really pose many demands for their pay, because they can be replaced by other workers. This is what has led to low wages of the unskilled workers, while increasing the wealth of the richest, who own the production means.