D. More than 1,000 languages are spoken in Africa.
There's estimated about 1,500 to 2,000 African languages.
The ocean-floor feature that is associated with trenches is a subduction zone. An oceanic trench is characterized by a narrow and very deep depression on the sea floor. This depression is caused by a subduction zone wherein two plate boundaries converge and one sinks at the bottom of the other plate, forming a thin and deep region between the two plates.
Answer:
The high islands of the Pacific were formed by seismic activity whereas the low islands of the Pacific were formed by coral growth. Continental islands and oceanic islands were formed by volcanic activity.
High islands often have fertile soils and lush rainforests. In contrast, low islands are often less fertile than high islands. Some low islands lack freshwater sources.
The mountains that you are describing are the Appalachians, which are the oldest mountains in North America that are present today. Due to millions of years of erosion from glaciers, wind, water and seismic activity, the Appalachians were rendered into hilly and rounded mountains, with the rough, rocky, and thin soil being mostly of sedimentary rock that was eroded from the mountains.