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.
Per capita income is the measure of the amount of money earned per person a geographic region. The formula is total income of area divided by the total population.
The tropical rainforest is a biome with a constant temperature and a high rainfall. The level of humidity and density of the vegetation give the ecosystem a unique water and nutrient cycle. Rainforests around the world are threatened by human expansion.
The answer is atmosphere. In atmosphere air is fluid like
the hydrosphere and which can then go around with heat energy across great
distances (latitudes) Heat can be transferred between air and water easily. Atmosphere Definition is vertical extension
10,000km (50% mass < 6km; 48% mass < 26km). Composition of atmosphere are N, O, Ar,
variable gases (water vapor, carbon dioxide, ozone.
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Answer:
So the Earth moves at about 110,000 km/h around the Sun (which is about one thousand times faster than the typical speed of a car on a highway!) ... This is the case for Earth's orbit. But not all ellipses come in the same shape.
Explanation:
