The vertical distance between a standard reference point, such as sea level, and the top of an object or point on the earth, such as a mountain is also referred to as the elevation.

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The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called

One of the main reasons societies settled along rivers in the neolithic era was because a) the village elders demanded it. b) the land there was more valuable. c) it was more safe and secure there. d) it provided irrigation for farming.

Fertility and mortality rates are higher in more developed nations.