Answer: The release of methane from thawed permafrost
Explanation:
With increasing global warming, permafrost in the arctic is melting. The carbon and methyl clathrates present in permafrost escape into the atmosphere to form carbon dioxide and methane, both greenhouse gases.
In the Arctic, molecules of methane are trapped in ice crystals as methyl clathrates. When the temperature increases, these crystals release methyl clathrates which become methane when in contact with the atmosphere.
The cause of the increasing atmospheric 
is due to the the thawing of dead organisms present in the permafrost. As the permafrost melts, these organisms decay and release into the atmosphere.
i took this test already
The correct answer is:
B. They earn as much money as people in other regions.
Answer:
a
Explanaiton that was what i think nasa told me i hope this helps
Answer:
Ophiolites
Explanation:
Ophiolites are regarded as a part of the Earth's oceanic crust and the underlying upper mantle which has moved up above the sea level thereby exposing it to the surface. They usually form a part of the continental crustal rocks.
Ophiolites are important and greatly influence Geologists having an idea about the composition of ocean crust.
The Danube is the second longest river in Europe flowing from Germany to the Black Sea passing through ten different countries. It is a major water supply for irrigation, crops and drinking water for millions of people, and is used as a major shipping route and for cultural tourist destination. (A) is correct as it passes through Budapest, Vienna, Bratislava and Belgrade (all capital cities), (C) is correct as there are many tourists travel to the river on cruises, (B) could be correct also, however its main natural resource is water, and its route, so I would not consider it to have "many" natural resources. And (D) would not be correct as the river flows West to East not North to South.
