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Waterfalls are formed over areas where hard rock lays over soft rock. When the river flows over soft rock, it erodes the soft rock away, which begins to undercut the hard rock which lays above. As the har...

Waterfalls form when a river flows over an area of softer rock after flowing over an area of harder rock. Due to the softer rock being more easily eroded than the harder rock, the soft rock undercuts the ...

Health Adjusted Life Expectancy

The enhanced greenhouse effect is the stronger impact caused by human emissions of greenhouse gases. Greenhouse gases include carbon dioxide, methane and water vapour and are often produced by burning fos...

Food aid is often donated by richer countries and is used in emergency situations but also to help solve long-term hunger. However, this type of aid comes with many disadvantages as often the type of food...