Setiap tahun mereka meninggalkan desanya dan hidup sebagai satu kesatuan kelompok di daerah perladangan untuk 4 sampai 6 bulan sampai panen selesai. Begitulah cara pemanfaatan hutan dengan berladang berpindah-pindah: membuka sebagian sangat kecil hutan di lingkungan huniannya dan membakar hasil tebangan untuk mendapatkan abu sebagai pupuk. Jika kesuburan telah menurun, mereka berganti lahan untuk membiarkan yang lama mengalami proses pemulihan alami. Jika tak berladang di hutan seperti itu, orang Ribun bertanam padi di tanah paya (tanah becek, berlumpur). Hampir setiap keluarga Ribun mempunyai ladang dan tanah paya di tepi hutan.

Selengkapnya di:http://4archiculture.net/post/52#comment_370

A mineral is a naturally occurring solid chemical substance formed through biogeochemical processes, having characteristic chemical composition, highly ordered atomic structure, and specific physical properties. By comparison, a rock is an aggregate of minerals and/or mineraloids and does not have a specific chemical composition. Minerals range in composition from pure elements and simple salts to very complex silicates with thousands of known forms. The study of minerals is called mineralogy. (Wiki)

Database mineral visit here: http://webmineral.com

The Mineralogy Database was last updated on 12/31/2009 and it contains 4,714 individual mineral species descriptions with links and a comprehensive image library. Visit the “What’s New” section for details.  

Each mineral has a page linked to tables devoted to crystallography, crystal structures, X-Ray powder diffraction, chemical composition, physical and optical properties, Dana’s New classification, Strunz classification, mineral specimen images, and alphabetical listings of mineral species. There also are extensive links to other external sources of mineral data and information.

Hari ini Jum”at 13 Juli 2012, RUU Pendidikan Tinggi telah disahkan menjadi UU Pendidikan Tinggi dalam rapat paripurna DPR.

Unduh naskah: RUU Pendidikan Tinggi