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
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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.
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Answer:
The easiest and most common way to invest in foreign markets is by purchasing exchange-traded funds (ETFs) or mutual funds that hold a basket of international stocks and bonds. Country Funds invest in specific countries, like Spain or Russia.
Explanation:
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Answer:
The orbital period of Earth in position A is greater than the orbital period of Mars in position B.
Explanation:
Since I cant see the diagram, this would be my best guess.
Answer:
Gravity
Explanation:
Gravity is a postulate based upon a given factor of proven events, you can always rely on gravity to pull something downwards towards earth.
