They are caused by vertical air currents.
Farming is considered the first and noblest profession. It is thought of as the profession of free people who have control over what they do in their lives and when they do it. Everyone does some farming during the rainy season (approximately late May through early October).
, permafrost is ground, including rock or (cryonic) soil, at or below the freezing point of water 0 °C (32 °F) for two or more years. Most permafrost is located in high latitudes (in and around the Arctic and Antarctic regions), but at lower latitudes alpine permafrost occurs at higher elevations. Ground ice is not always present, as may be in the case of non-porous bedrock, but it frequently occurs and it may be in amounts exceeding the potential hydraulic saturation of the ground material.
Answer:
the top and bottom halves of earth
