Subsistence farming is not used anymore, only occasionally in certain parts of the world but in the 1800's it was used in the U.S. by people who only planted enough to get them by, and if they had the smallest portion left they traded it, typically for alcohol
The answer is A. and B.
Let's look into the options one by one:
A. pressure and heat built up in the magma chamber
This is true as the pressure and heat built up is what cause the magma to be pushed out of the chamber through the vent. The higher temperature it is,the more it expands and the more likely it is to erupt.
B. plate tectonics and subduction
This is also true as volcanicity is caused by plate tectonics such as subduction. When the plate bends, cracks are formed which coul then be filled by magma and cause fissure eruption, afterwards forming volcanoes.
C. ground swelling and foreshocks
These are the consequences of volcanic eruption but not the causes and therefore is not true.
D. foreshocks and aftershocks
These are as well the consequences of volcanic activity like above and is not true.
Therefore the answers are A. and B.
Hope it helps!
The Aral Sea is bordered by two Central Asian countries.
Explanation:
The Aral Sea is located in Central Asia. It is in the territory of two countries, roughly divided in half, with the northern half being in Kazakhstan, and the southern half being in Uzbekistan. Despite the name, it is not actually a sea, but instead it is a lake, which is remnant of a former ocean that existed tens of millions of years ago. It has been called sea because of its saline water.
The Aral Sea though is on the verge of drying out. The main reason for this has been that the local population is using extensively the waters of Amu Darya and Sir Darya, which are the two rivers that supply the lake with water. Having its water income significantly reduced, and being in a very dry area, the evaporation surpasses the flow of water coming into the lake, so it has gradually been drying out.
Other lakes in the region are:
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