Why does the earth have a nickel-iron core at its center, surrounded by a silicate mantle? a. silicates are less rigid than metal, so the mantle and crust flowed outward to the exterior b. the core formed first from metallic meteoritesc. a metal core occurs at the center of most planetsd. because it is more dense, the core material sank to the center of the earthe. the intense pressure at the center of the earth caused primordial nebular material to transmutate into metal
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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.
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Why do farmers in different regions use different farming techniques
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Horizon a is also sometimes called a. topsoil b. subsoil c. bedrock d. weathered bedrock
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Why does the earth have a nickel-iron core at its center, surrounded by a silicate mantle? a. silic...
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