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National Geographic Education Video

National Geographic Education Video
Related:  Changing Earth

Sastra Jawa What’s So Bad About Dams, Anyway? In our line of work removing old dams to restore rivers, one of the most common questions people ask is “what’s so bad about dams, anyway?” It’s a great question and could be a short or long answer, depending on how detailed you want to get. I’ll attempt to summarize the key issues here. 1. Dams block movement of fish and other species. 2. 3. 4. 5.

Hoover Dam Directions Views from a helicopter of Hoover Dam. Hoover Dam, once known as Boulder Dam, is a concrete dam in the Black Canyon of the Colorado River, on the border between Arizona and Nevada. It was built between 1931 and 1936 during the Great Depression. View of Hoover Dam with Lake Mead behind it. Hoover Dam is 30 miles from Las Vegas. Hoover Dam has no address. When driving from Las Vegas take I-515 South towards Boulder City. Shortly before you reach Boulder City, I-515 ends and Route 93 continues as a two lane highway to Hoover Dam. When driving to Hoover Dam from Las Vegas, stop at the parking garage on the left before you get to the dam.

Ibnu Al Shatir Mungkin banyak yang belum ngeh, kalau dasar-dasar Heliosentris itu bisa jadi muncul pas jaman kejayaan astronomi di jazirah Arab. Dari SD kita sudah dicekokin bahwa heliosentris itu dirumuskan oleh Copernicus, bla bla bla .. Okay, kita tidak sedang belajar sejarah, itu bidang-nya pakar sejarah (OOT: pak Roy Suryo bisa membantu saya gak ya?). Tapi belajar sedikit tentang sejarah itu perlu. Dari mana Copernicus dapat ide (matematis) tentang matahari sebagai pusat tata surya (heliosentris)? Ibnu Al-Shatir adalah seorang pakar Muwaqqit di Mesjin Umayyad, Damaskus, sekaligus sebagai orang yang membangun sundial (ter?) Dari pengalamannya di dunia astronomi, Ibnu Al-Shatir menulis buku tersebut, yang merombak habis teori geosentris Ptolemeus; kendati belum beranjak dari teori geosentris, tapi secara matematis, Al-Shatir memperkenalkan adanya epicycle yang rumit (sistem lingkaran dalam lingkaran). Matematika adalah bahasa yang universal, mempunyai kebenaran ilmiah yang tidak terbantahkan. Related

Why We Remove Dams Over the past 100 years, the United States has led the world in dam building – blocking and and harnessing rivers for a variety of purposes, including hydropower, irrigation, flood control, and water storage. The US Army Corps of Engineers has catalogued at least 80,000 dams greater than 6 feet along the waterways of the United States – and at least tens of thousands of smaller dams pepper our rivers and streams. Secretary of the Interior Bruce Babbitt recently observed that, “on average, we have constructed one dam every day since the signing of the Declaration of Independence.” While dams can benefit society, they also cause considerable harm to rivers. Dams have depleted fisheries, degraded river ecosystems, and diminished recreational opportunities on nearly all of the nation’s rivers. Today, many dams are old, unsafe or no longer serve their intended purposes. How Do Dams Damage Rivers? 1. By diverting water for power, dams remove water needed for healthy in-stream ecosystems. 2. 3.

Two years on at Chaitén « The Volcanism Blog Posted by admin in Chaitén, Chile, eruptions, volcanoes. Tags: Chaitén, Chile, volcanic eruptions trackback View of Chaitén caldera and lava dome before the May 2008 eruption (© Eric Manríquez). The eruption of Chaitén volcano in southern Chile began two years ago today, on 2 May 2008. Since that date eruptive activity at the volcano has continued uninterrupted: the intensity has varied, but the activity has never ceased. View from May 2009 of the Chaitén dome complex (courtesy Mr Javier Romero, Vialidad MOP, Puerto Montt). During the coming week, to mark the second anniversary of Chaitén’s awakening, there’ll be a series of posts here at the Volcanism Blog looking at various aspects – volcanological, social, economic and environmental – of this remarkable and endlessly fascinating eruption. Sequence of images of the Chaitén lava dome during March 2010 (SERNAGEOMIN). UPDATE. For all our Chaitén coverage: Chaitén « The Volcanism Blog.

Al-Hallaj, Sufi yang Disalib dan Dibakar (Bagian 1) Sufi besar ini mempunyai tempat cukup penting dalam dunia tasawuf. Pernyataan-pernyataannya cendrung kontroversial. Seperti Socrates – fisuf besar Yunani sekian abad sebelum masehi yang harus mati minum racun, Al-Hallaj juga tokoh besar dan filsuf yang dihukum mati karena mempertahankan pendapat dan ajarannya. Mereka sama-sama meninggalkan banyak legenda yang masih dibicarakan orang hingga kini. Lebih penting lagi ialah pemikiran dan gagasan-gagasannya yang brilian. Sudah ratusan buku yang membahas kedua tokoh ini. Dalam dunia sufi, Al-Hallaj mempunyai kisah tersendiri. Ia lahir dengan nama Abu Al-Mugis Al-Husain ibnu Mansur al-Baidlawi pada 858 M / 244 H di Baida, di Provinsi Fars, Iran. Ketika berguru pada Al-Makki itulah ia mulai mendapat pemahaman tentang Wahdatul Wujud, dan sejak itu ia banyak melontarkan ucapan-ucapan yang kontroversial. Meski bagi banyak orang dianggap nyeleneh, Al-Hallaj juga berdakwah. Ia menulis sejumlah kitab dan bait-bait puisi. “Engkau tidak ikut?”

Colorado River Map Balancing Limited Supply With Increasing Demand The Colorado River Basin is a critical component of North American water supply, providing H2O to 30 million people and thousands of acres of farmland. When Colorado River withdrawals were first allocated among the river basin’s seven states, in 1922, the river held 17.5 million acre-feet (5.7 trillion gallons) of water. However, new science has shown that 1922 was part of an especially wet period. The river now averages about 14.7 million acre-feet per year and is allocated among seven states and Mexico. Water managers are trying to address growing challenges associated with over-allocation, rapidly increasing urban populations, development of unused water rights, and expected climate change.

Minimizing Dam Impact on the Yangtze River By Misty Herrin As China’s demand for energy skyrockets, so, too, does pressure to harness the power of the mighty Yangtze River. Twelve new dams are planned for the upper reaches of the Yangtze; three are already under construction. While these dams will provide energy for millions, they will have serious impacts on ecosystems and the fish supplies that sustain the very same families. The Nature Conservancy is engaging with dam builders and public agencies to improve how the dams are designed and operated. discussed the significance of these partnerships with Dr. What has this collaboration meant for people and nature along the Yangtze? Qiaoyu Guo: So far, it's led to some very promising first steps. We all agree that we’ve got to balance the need for hydroelectric power with the need to protect the water and fish supplies that sustain 400 million people living in the region. Why are these partners interested in working with The Nature Conservancy?

Sorban Rasulullah SAW » Cara Muhammad Rasulullah SAW senang mengenakan penutup kepala, yang biasa disebut Sorban atau ‘Imamah. Sorban Rasulullah SAW Beberapa hal tentang sorban Rasulullah SAW yang dikemukakan para sahabat adalah: Rasulullah SAW sering terlihat mengenakan sorban (‘imamah) berwarna hitamRasulullah SAW mengenakan sorban dengan melepaskan ujung sorbannya di antara kedua bahunyaRasulullah SAW pernah menggunakan minyak rambut ketika sedang mengenakan sorbanRasulullah SAW pernah terlihat mengenakan sorban ketika sedang berpidato Referensi: Dalam sebuah riwayat yang bersumber dari Jabir dikemukakan: “Nabi saw memasuki kota Makkah pada waktu Fathu Makkah beliau mengenakan sorban (‘imamah) hitam.” Baca Juga: Segala yang benar di blog ini datang dari Allah SWT.

National Geographic Freshwater 101: Rivers Rivers and their tributaries are the veins of the planet, pumping freshwater to wetlands and lakes and out to sea. They flush nutrients through aquatic ecosystems, keeping thousands of species alive, and help sustain fisheries worth billions of dollars. Rivers are also the lifeblood of human civilizations. They supply water to cities, farms, and factories. Rivers carve shipping routes around the globe, and provide us with food, recreation, and energy. Hydroelectric plants built from bank to bank harness the power of water and convert it to electricity. But rivers are also often the endpoint for much of our industrial and urban pollution and runoff. Over the course of human history, waterways have been manipulated for irrigation, urban development, navigation, and energy. The Colorado River provides an excellent example of what happens when demand for river water—for cities, industry, energy production, and agriculture—threatens to outpace supply. River Facts

March 2008 - Down with the Dams: Unchaining U.S. Rivers Congress gets involved Oregon’s Marmot Dam serves as an experiment, showing what can happen when a large dam is removed from a river. More than anything else, dams have changed the fluvial landscape of the United States. In recent years, however, there has been a growing reversal — only a trickle at first, but now a steady stream of dams are being removed. The Impetus Although still less than 1 percent of all dams, these removals constitute a change in thinking in human intervention of fluvial landscapes. For these dams, the original 30- to 50-year FERC licenses are expiring after the pulse of dam building during the 1950s through 1970s. The Issues Dam removal, however, is complicated. The fate of the previously sequestered sediment (and possible contaminants) is a major issue, and commonly drives decisions regarding dam removal. These complications are especially evident in the Pacific Northwest, where many dams are targeted for removal. So … What Happened? Back to top

Sunnah Nabi, malaikat dan sahabat : memakai sorban (warna putih – hitam – hijau – Merah – Kuning) dan keutamaanya | Kenapa saya keluar dari salafy / salafi/sunni palsu /wahaby/wahabi/darul hadits / DHIYA’US SUNNAH / wahdah islamiyah/al-Nidaa'/LBI Al atsar Sorban Rasulullah masih utuh 1. dari Amr bin Umayyah ra dari ayahnya berkata : Kulihat Rasulullah saw mengusap surbannya dan kedua khuffnya (Shahih Bukhari Bab Wudhu, Al Mash alalKhuffain).2. dari Ibnul Mughirah ra, dari ayahnya, bahwa Rasulullah saw mengusap kedua khuffnya, dan depan wajahnya, dan atas surbannya (Shahih Muslim Bab Thaharah)3. para sahabat sujud diatas Surban dan kopyahnya dan kedua tangan mereka disembunyikan dikain lengan bajunya (menyentuh bumi namun kedua telapak tangan mereka beralaskan bajunya krn bumi sangat panas untuk disentuh). saat cuaca sangat panas. (Shahih Bukhari Bab Shalat).4. Rasulullah saw membasuh surbannya (tanpa membukanya saat wudhu) lalu mengusap kedua khuff nya (Shahih Muslim Bab Thaharah)5. “Saya melihat Sallallahu alayhi wa sallam sedang berwudhu. 6. 9. 10. 11. 12. “Allah Ta’âla menurunkan rahmat-Nya kepada orang yang memakai sorban pada hari Jum’at dan para malaikat akan mendo’akan mereka.” 13. 14. (Fatâwa Rashidia Hal.326) 15. 18.