How many seismographs are needed to find the epicenter of an earthquake? why is this number significant?
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Explain why components that are naturally found in air can be considered air pollutants.

Use your vocabulary words to complete the sentences below. more of the world's population is now concentrated in heavily populated urban areas known as a this is quite a contrast from the past when or native groups were either farmers or — hunters and gatherers who moved between places in search of food. advanced technology has led to the integration of world economics and cultures, in the world's more developed countries. this integration requires , the responsible use and management of natural resources.

In the diagram below, ab and bc are tangent to o. what is the measure of