Answer:
D vulnerable to attack from warring civilizations.
Explanation:
i checked and got it right
Answer: Plastic waste and industrial effluent too choke India's holy river. But the most serious long-term threat to the Ganges is lack of water. For many years, the flow of the river has been ebbing. Activists blame most of the deficit on unsustainable extraction.
Explanation:
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.
