Answer:
mountain chains, earthquakes, volcanoes.
The are where an oceanic plate descends into the upper mantle is called a subduction zone.
Here were the choices on that question:
a. poverty
b. lack of adequate rivers
c. mountains
<span>d. richness
The answer is D. richness. Based on A Companion to World History, the African Sahel can be a corridor of communication between Nile and Niger valleys but did not materialize. The reason was the richness of Sahel that it that it can provide for itself even without trade.
</span>
<span>B) secondary
</span>In 2006, an underwater volcano created a new island near the Tonga Islands. Since then, waves and other forces of weathering have created beaches on the<span>island. These beaches are considered _____ landforms.
</span>
NOT:
primary
tertiary
