Highwall mining is often used when excavating an open-pit mine becomes too expensive. There are many advantages over underground mining, including the fact that it is both more cost-effective and involves less lead time.
The answer is III, raising retirement age and building more schools will not affect this situation very much, while paid maternity leave will help raise the birth rate.
Answer:
Upon contact with the continental plate, the oceanic plate, being denser, begins to sink into the asthenosphere. This sinking of the plate is called subduction. Once in the asthenosphere, the oceanic plate melts due to high temperatures. The melts thus formed come to the surface in the form of volcanic eruptions, forming a volcanic chain of subduction.
When two plates come in contact, a collision is created, which leads to earthquakes or sediment wrinkles, followed by their elevation and mountain formation.
<em>Thus, the mountain ranges were formed: the American Cordillera and the Himalayan mountains.</em>
Fertile black and dark brown soils, grains, natural range where cattle can graze. Coal, natural gas, oil, and potash
