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2. Five themes of geography - Wikipedia

   en.wikipedia.org/wiki/Five_themes_of_geography

   The influence of the five themes can still be found in many standards, such as the National Council for the Social Studies (NCSS) Standards for elementary grades. [9] With the increase of emphasis placed on standardized testing in the United States, social studies, and thus geography, is receiving less time in elementary classrooms. [10]

3. Earth science - Wikipedia

   en.wikipedia.org/wiki/Earth_science

   Earth science or geoscience includes all fields of natural science related to the planet Earth. [1] This is a branch of science dealing with the physical, chemical, and biological complex constitutions and synergistic linkages of Earth's four spheres: the biosphere , hydrosphere / cryosphere , atmosphere , and geosphere (or lithosphere ).

4. Internal structure of Earth - Wikipedia

   en.wikipedia.org/wiki/Internal_structure_of_Earth

   Earth's crust and mantle, Mohorovičić discontinuity between bottom of crust and solid uppermost mantle. Earth's mantle extends to a depth of 2,890 km (1,800 mi), making it the planet's thickest layer. [20] [This is 45% of the 6,371 km (3,959 mi) radius, and 83.7% of the volume - 0.6% of the volume is the crust].

5. NASA's Space Place - Wikipedia

   en.wikipedia.org/wiki/NASA's_Space_Place

   The site includes informative articles, hands-on activities, and interactive web games. [2] [3] In addition to its content geared toward children, there are resources for parents and educators. It was one of the first NASA websites to produce a companion Spanish language site. Space Place is produced by a team at the Jet Propulsion Laboratory. [2]

6. World map - Wikipedia

   en.wikipedia.org/wiki/World_map

   A world map is a map of most or all of the surface of Earth. World maps, because of their scale, must deal with the problem of projection. Maps rendered in two dimensions by necessity distort the display of the three-dimensional surface of the Earth. While this is true of any map, these distortions reach extremes in a world map.

7. AOL Mail

   mail.aol.com/d?reason=invalid_cred

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!