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2. Common Core - Wikipedia

   en.wikipedia.org/wiki/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 school grade.

3. Internal structure of Earth - Wikipedia

   en.wikipedia.org/wiki/Internal_structure_of_Earth

   Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 19% of Earth's radius [0.7% of volume] or 70% of the Moon's radius. The inner core was discovered in 1936 by Inge Lehmann and is generally composed primarily of iron and some nickel. Since ...

4. World Book Encyclopedia - Wikipedia

   en.wikipedia.org/wiki/World_Book_Encyclopedia

   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 ...

5. World Reference Base for Soil Resources - Wikipedia

   en.wikipedia.org/wiki/World_Reference_Base_for...

   The World Reference Base for Soil Resources ( WRB) is an international soil classification system for naming soils and creating legends for soil maps. The currently valid version is the fourth edition 2022. [1] It is edited by a working group of the International Union of Soil Sciences (IUSS). WRB, 4th edition (2022)

6. Earth - Wikipedia

   en.wikipedia.org/wiki/Earth

   Earth is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System. Of the four rocky planets, it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it, taking a year (about 365.25 days) to complete one revolution.

7. Worldsheet - Wikipedia

   en.wikipedia.org/wiki/Worldsheet

   v. t. e. In string theory, a worldsheet is a two-dimensional manifold which describes the embedding of a string in spacetime. [1] The term was coined by Leonard Susskind [2] as a direct generalization of the world line concept for a point particle in special and general relativity . The type of string, the geometry of the spacetime in which it ...