About 1.6-1.9 million years ago the planet entered the epoch, that has also been called the "ice age.":

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.

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Rocks that contain crystals that are roughly equal in size and can be identified with the unaided eye are said to exhibit a texture.