Answer:SHANGHAI—For over three decades the Chinese government dismissed warnings from scientists and environmentalists that its Three Gorges Dam—the world's largest—had the potential of becoming one of China's biggest environmental nightmares. But last fall, denial suddenly gave way to reluctant acceptance that the naysayers were right. Chinese officials staged a sudden about-face, acknowledging for the first time that the massive hydroelectric dam, sandwiched between breathtaking cliffs on the Yangtze River in central China, may be triggering landslides, altering entire ecosystems and causing other serious environmental problems—and, by extension, endangering the millions who live in its shadow.
The largest feature beneath the earth is the ocean basin. Ocean basin is a large geological basin that is below sea level and located before the trenches. Ocean basin covers three quarters of the earth's surface. Pacific Ocean has the largest ocean basin.
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.
Answer: Sand and gravel deposits.
Explanation:
Glaciation is a natural phenomenon in which the temperature of the earth drops considerably over a long period, this causes the glaciers of the poles to expand to cover large extensions of continental and oceanic terrain.
When the temperature rises again and the ice from the glaciers recedes, large deposits of sand and gravel are formed. This is because the deglazing process is slow, and the retreating glaciers remove the surface layers of the earth, therefore mineral deposits are formed. Also, the deglaciation process forms rivers and lakes that leave large deposits of sand and gravel.
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