One of the most striking ongoing changes in the Arctic is the rapid melting of sea ice. Some climate models predict that, sometime during the first half of the 21st century, summer sea ice will vanish from the Arctic Ocean. An absence of summer ice would amplify the existing warming trend in Arctic tundra regions as well as in regions beyond the tundra, because sea ice reflects sunlight much more readily than the open ocean and, thus, has a cooling effect on the atmosphere. In addition, research indicates that the retreat of sea ice would enhance the productivity of tundra vegetation, and the resulting buildup of plant biomass might lead to more extreme events such as large tundra fires. Finally, an ice-free Arctic Ocean would improve access to high northern latitudes for recreational and industrial activities; this would likely place additional stress on tundra plants and animals as well as compromise the resilience of the tundra ecosystem itself. In alpine tundras too, climate warming could encourage more human activity and increase damage to plant and animal populations there.
The fate of permafrost in a warmer world is a particularly important issue. Together, tundra and taiga account for approximately one-third of global carbon storage in soil, and a large portion of this carbon is tied up in permafrost in the form of dead organic matter. Some of this organic matter has been preserved for many thousands of years, not because it is inherently difficult to break down but because the land has remained frozen. Thawing of the permafrost would expose the organic material to microbial decomposition, which would release carbon into the atmosphere in the form of CO2 and methane (CH4). Rates of microbial decomposition are much lower under anaerobic conditions, which release CH4, than under aerobic conditions, which produce CO2; however, CH4 has roughly 25 times the greenhouse warming potential of CO2. The Arctic has been a net sink (or repository) of atmospheric CO2 since the end of the last ice age. At the same time, however, the region has been a net source of atmospheric CH4, primarily because of the abundance of wetlands in the region.
Answer:
<u>ESSAY ABOUT:</u>
<u>MAIN NEWS: NEW YORK EPIC CENTER OF THE CORONAVIRUS EPIDEMIC.</u>
Explanation:
It will be highlighted in the following essay how two two sources of national and international information highlight this news. Faced with the coronavirus epidemic, many questions arise, such as; As it is possible that the United States in so little time stands out for exceeding the number of infected countries like Italy and China, before this we will see below what could have happened.
According to the <em>El Pais editorial (Madrid editorial)</em>, this happened because they did not have a national strategy, and New York does not have a good hospital system, the same respirator is being used for two patients.
According to the<em> Las Americas editorial</em>, the USA surpasses Italy first and then China, and the federal government sent 400 respirators to New York, when 30,000 are needed. So far, 40,000 retirees and medical students have volunteered to strengthen medical teams. The epidemic is expected to peak in two to three weeks.
Answer: I Beleive lighter layers are on top but I’m not sure
Explanation:
Answer:
<h2>
A) mitochondria</h2>
Explanation:
Most of the reactions occur in the mitochondria however enzymatic process first begin in the cytoplasm. Because that is not in the answers given, mitochondria is the correct answer.
Translation= <span>Why do </span>volcanoes and earth are more frequent in certain regions of the planet?
They get more frequent the hotter it gets. Plus you have to count in the ring of fire which is a circle of volcanoes and not actually fire. In places that circle the pacific ocean.
