heterotactic [struc petrol] . Said of the symmetry of a fabric in which not all the subfabrics agree in symmetry. Cf: homotactic [struc petrol].
Earth Science Week 2014 celebrates the theme "Earth's Connected Systems," emphasizing interactions among the Earth systems of land, water, air, and life.
We invite students and others to participate in research on earthquakes, coastal erosion, flooding, landslides, and other geoscientific phenomena.
Join the Earth Science Week team in encouraging everyone to explore careers in the geosciences!
Denver and Houston are kicking off local Earth Science Week celebrations this year. Will your town be next?
Discover resources, access classroom activities, find links, explore Big Ideas, enter the Center
Learn about the program, receive free newsletter, see webcasts, view images, much more
Plan your event, view calendar, see upcoming dates, find local organizations
Promote contests, target special days, see city celebrations, learn outdoors, explore careers and social networking, apply for award
Answer your questions, get the newsletter, view webcasts and photos, meet our sponsors
Order a Toolkit, access classroom activities, share Big Ideas, enter the Center
Plan an event, see upcoming events, connect with Earth science organizations
Enter contests, target special days, see city celebrations, learn outdoors, explore careers and social networking
Read press releases, answer FAQs, view proclamations, read past highlights, meet sponsors
View webcasts, see photo gallery, download free images and logos
Obtain a Toolkit, review classroom activities, explore the Center
Learn about Focus Days, find Citywide Celebrations, see contests, check out social networking and awards
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