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Become a nitrogen atom in the nitrogen cycle in our Traveling Nitrogen Classroom Activity Kit/Game. See all our games, activity kits and classroom activities.
Drawing by Rei Inamoto.


Following the defeat of the Titans by the Jovian gods, Hades obtained the kingdom of the underworld. One day, while he was riding through the field of battle, the goddess Aphrodite had her companion Eros playfully shoot an arrow into the heart of Hades.

Struck by Eros' arrow, Hades fell in love with the first young lady he saw, who happened to be Persephone. Hades promptly carried her off into the underworld to be his bride.

Dead souls were escorted to the shores of the River Styx by Hermes, where they were received by the boatman Charon, who rowed them across the River Styx to Hades' kingdom.

Many characters throughout greek myth crossed the path of Hades. Odysseus, the famous greek hero, entered the realm to speek to lost souls. He spoke to his dear friend Tiresias, who told him his destiny. He also came across his dead mother, Anticlea, and the great warrior, Achilles. Odysseus was the only one to successfully make a trip to Hades and return to Earth.

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Our online store includes issues of NESTA's quarterly journal, The Earth Scientist, full of classroom activities on different topics in Earth and space science, ranging from seismology, rocks and minerals, oceanography, and Earth system science to astronomy!

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA