Praxis Elementary Science Complete Questions and Correct Detailed Answers (Verified Answers)

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Praxis Elementary Science Complete Questions
and Correct Detailed Answers (Verified
Answers)
Question: Layers of the earth


Ans: inner core

outer core

lower mantle

upper mantle

crust



Question: layers of the crust


Ans: asthenosphere

lithosphere



Question: asthenosphere


Ans: molten rock layer



Question: lithosphere



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Ans: the solid plate tectonics, floating on the asthenosphere



Question: how many plates are there on earth


Ans: 8 major plates



Question: mineral


Ans: a naturally occurring substance ,representable by a chemical formula,
that is usually solid and inorganic, and has a crystal structure



Question: rock


Ans: different from a mineral in that it can be an aggregate of minerals or
non-minerals and does not have a specific chemical composition



Question: what is the inside of the earth like?


Ans: three solid and one liquid layer

the core is a solid iron ball



Question: what is concrete made of?




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Ans: water

cement

aggregates



Question: fossil fuel


Ans: a natural fuel such as coal or gas, formed in the geological past from the
remains of living organisms



Question: how are fossil fuels formed


Ans: decayed plants and animals that have been converted to crude oil, coals,
natural gas, or heavy oils by exposure to heat and pressure in the earth's
crust over hundreds of millions of years



Question: fossil


Ans: the remains or impression of a prehistoric organism preserved in
petrified form or as a mold or cast in rock



Question: how is a fossil formed


Ans: Fossils are formed in a number of different ways, but most are formed
when a plant or animal dies in a watery environment and is buried in mud and



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silt. Soft tissues quickly decompose leaving the hard bones or shells behind.
Over time sediment builds over the top and hardens into rock.



Question: what minerals are in salt water


Ans: sodium chloride

calcite



Question: four major oceans


Ans: atlantic

pacific

indian

artic



Question: what are the main gases that make up the atmosphere


Ans: mostly nitrogen and oxygen very small percent of other gases



Question: layers of the atmosphere




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