The Northeast became a leader in commerce because of its location and early development of industrial industries. The Northeast became a manufacturing hub in the colonies and in the newly formed United States which created specialization and the growth of commerce in this region relative to the South which was more agriculturally based.
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Scientists use waves to study the different layers of the earth. Usually, they use seismic waves, which are waves generated by earthquakes or nuclear-test explosions. So, scientists study the path and speed of these waves through the earth to decipher boundaries and the materials that make up the layers.
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Depletion of natural resources (water, forests, etc.) Pollution (air pollution, noise, sewage, waste and littering) Physical impacts (construction activities, marina development, trampling, loss of biodiversity)
Only tropical cyclones that form over the Atlanic Ocean or eastern Pacific Ocean are called "hurricanes." Whatever they are called, tropical cyclones all form the same way. Tropical cyclones are like giant engines the use warm, moist air as fuel. That is why they form only over warm ocean water near the equator.
