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Question
What organic compounds are essential for DNA and RNA to form?A) ammonia and methane
B) hydrogen sulfide
C) carbon dioxide
D) oxygen
E) amino acids
Answer
This answer is hidden. It contains 1 characters.
Related questions
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Cleavage is related to the internal structure of a mineral.
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An atom with 30 protons always has 30 neutrons and 30 electrons.
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A mineral can be composed entirely of one element.
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A) coal
B) ice
C) helium gas
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A naturally occurring concentration of one or more metallic minerals that can be extracted economically is a(n) ________.
A) reserve
B) ore
C) resource
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A) luster
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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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Use the Periodic table below to answer the following questions: When electrons are shared amongst all atoms, the resulting bond is a(n) ________ bond.
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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.
C) It behaves as a nonmetal, accepting electrons to form an ion with charge -2.
D) It tends to be inert, and thus is dispersed throughout the crust.
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Which electrons are responsible for most chemical bonding?
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D) Any electron can exchange with adjacent atoms to form a bond; there is no preference.
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Internally, the earth consists of spherical shells with different compositions and densities.
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Which of the following is not a system?
A) the biosphere
B) soil, plants, rock, soil organisms, and animals
C) the study of minerals
D) the Pacific Ocean and the west coast of North America
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A) the Sun
B) heat from Earth's interior
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D) none of the above
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A) deep-ocean trenches
B) oceanic ridges
C) seamounts
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B) flat areas that include rocks older than 1 billion years old
C) flat river valleys that cut through older mountain ranges
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Flat, stable areas of continental crust tend to be located ________.
A) along coastlines
B) near desert regions
C) in the interior of continents
D) in areas that receive large amounts of rainfall
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A major cause of the differences in elevation between ocean basins and continents is ________.
A) viscosity
B) temperature
C) density
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The Andes Mountains in South America are formed by ________.
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B) sea floor spreading
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A) Lithosphere
B) Asthenosphere
C) Lower mantle
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A) hot spots on the sea floor, like Iceland
B) spreading ridges
C) convergent plate margins
D) transform plate margins