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Question
During the earliest history of the earth, ________ .A) the earth did not have any radioactive material
B) the temperature increased so that iron and nickel melted
C) almost all of the material was radioactive, and it decayed to the compositions we have today.
D) the earth was cold and lacked any source of heat.
Answer
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Related questions
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A) coal
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What does the tendency of micas to produce thin cleavage flakes suggest about its crystal structure?
A) The crystal structure is characterized by complex polymerized mats that form a sheetlike structure.
B) The structure is characterized by rings that form an interlocking network, forming planar sheets.
C) The structure is produced by flow in the igneous rock, aligning glass layers within the crystal structure.
D) The atoms are arranged in orderly arrangements that form strongly bonded sheets separated by weak bonds between the sheets.
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B) ionic
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Use the Periodic table below to answer the following questions: Element 20, Ca, has what chemical property?
A) It behaves as a metal ion, giving up two electrons to form a +2 ion.
B) It tends to form covalent bonds and an ion with a charge of +1.
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D) It tends to be inert, and thus is dispersed throughout the crust.
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B) innermost electron shell because the electrons can be transferred to the nucleus
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D) Any electron can exchange with adjacent atoms to form a bond; there is no preference.
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B) heat from Earth's interior
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A) deep-ocean trenches
B) oceanic ridges
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B) spreading ridges
C) convergent plate margins
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