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  2. Rare-earth element - Wikipedia

    en.wikipedia.org/wiki/Rare-earth_element

    Rare-earth elements occur in nature in combination with phosphate ( monazite ), carbonate - fluoride ( bastnäsite ), and oxygen anions. In their oxides, most rare-earth elements only have a valence of 3 and form sesquioxides (cerium forms CeO2 ). Five different crystal structures are known, depending on the element and the temperature.

  3. Common Core - Wikipedia

    en.wikipedia.org/wiki/Common_Core

    Common Core. The Common Core State Standards Initiative, also known as simply Common Core, was a multi-state educational initiative begun in 2010 with the goal of increasing consistency across state standards, or what K–12 students throughout the United States should know in English language arts and mathematics at the conclusion of each ...

  4. Next Generation Science Standards - Wikipedia

    en.wikipedia.org/wiki/Next_Generation_Science...

    The Next Generation Science Standards (NGSS) are based on the "Framework K–12 Science Education" that was created by the National Research Council. They have three dimensions that are integrated in instruction at all levels. The first dimension is the Disciplinary Core Ideas (the DCIs), which consists of content and concepts specific to four ...

  5. Lexile - Wikipedia

    en.wikipedia.org/wiki/Lexile

    e. The Lexile Framework for Reading is an educational tool that uses a measure called a Lexile to match readers with books, articles and other leveled reading resources. Readers and books are assigned a score on the Lexile scale, in which lower scores reflect easier readability for books and lower reading ability for readers.

  6. Spherical Earth - Wikipedia

    en.wikipedia.org/wiki/Spherical_Earth

    Spherical Earth or Earth's curvature refers to the approximation of the figure of the Earth as a sphere. The concept of a spherical Earth gradually displaced earlier beliefs in a flat Earth during classical antiquity and the Middle Ages. The figure of the Earth is actually more accurately described as an ellipsoid, which was realized in the ...

  7. National Assessment of Educational Progress - Wikipedia

    en.wikipedia.org/wiki/National_Assessment_of...

    The National Assessment of Educational Progress ( NAEP) is the largest continuing and nationally representative assessment of what U.S. students know and can do in various subjects. NAEP is a congressionally mandated project administered by the National Center for Education Statistics (NCES), within the Institute of Education Sciences (IES) of ...

  8. Mathematics education in the United States - Wikipedia

    en.wikipedia.org/wiki/Mathematics_education_in...

    e. Mathematics education in the United States varies considerably from one state to the next, and even within a single state. However, with the adoption of the Common Core Standards in most states and the District of Columbia beginning in 2010, mathematics content across the country has moved into closer agreement for each grade level.

  9. World Book Encyclopedia - Wikipedia

    en.wikipedia.org/wiki/World_Book_Encyclopedia

    The World Book Encyclopedia is an American encyclopedia. [ 1] World Book was first published in 1917. Since 1925, a new edition of the encyclopedia has been published annually. [ 1] Although published online in digital form for a number of years, World Book is currently the only American encyclopedia which also still provides a print edition. [ 2]

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