Answer: D. It can melt to a depth of a few meters in summer, then refreeze in winter.
Explanation:
Permafrost is ground which remains frozen for two or more years. Permafrost consists of soil, rock and sand fused together by ice. Mostly found in areas in high altitude, the Arctic, Antarctica, it is common in periglacial environments where temperatures are below freezing
.
The topmost layer of permafrost can melt in summer and refreeze in winter. This thawing and refreezing produces a ground pattern called columnar joints similar to the one formed when molten lava cools.
Answer:
1. Endangered Species conservation
2. Air Pollution
3. Destruction of Coral Reefs
Explanation:
"Asia sits almost entirely in the tropics, and as such, is covered in rich, dense, biologically diverse jungle." Poachers, large companies exploiting land, small farms,(Etc), have always been a large factor of how hard it is to conserve the endangered species.
Small farms and large companies burn fires trying to clear land of trees(among other things.) So that then they can exploit the land the following year.
Over the past several decades, Asia's famous coral reefs have always been in dismay. This is the result of several factors like; 1. The ocean absorbs most of the carbon dioxide we put into the atmosphere each year. While this helps reduce the effects of global warming (temporarily), it also means that more of that carbon is going to be converted into carbonic acid, increasing the ocean’s acidity level.
The railroad tracks are parallel, because they go the same direction and don't intersect
