jueves, 1 de diciembre de 2016

National geographic ➥ Strange Things In the Amazon Forest ▶ BBC wildlife animal documentary ᴴᴰ 2016

National geographic ➥ Strange Things In the Amazon Forest ▶ BBC wildlife animal documentary ᴴᴰ documentaries : documentaries HD Documentaries :

How Hackers Changed the World: We Are Legion - Anonymous - BBC Documentary | HD Documentary 2016 ➥ The Secret Places On Earth China ☠ United States ☠ Russia ☠ India A380 ➥ Documentary HD ▶ National Geographic 2016 Geographic Documentary 2016 HD - Stolen Innocence SHOCKING FBI CRIME [ Documentary HD in Prison National Geographic Documentary Full HD -The Most Dangerous Prison In USA [2016 2016 ➥ How China Rules the World Full Documentary HD [NEW 2016] - National Geographic Hunting prey 2016 HD ➥ Documentary National Geographic ▶ Animals attack Kills Most Violent Prison Documentary 2016 HD - Part 2 - Maximum Channel-South Africa's Mponeng Gold Mine-Build it Bigger Amazon rainforest (Portuguese: Floresta Amazônica or Amazônia; Spanish: Selva Amazónica, Amazonía or usually Amazonia; French: Forêt amazonienne; Dutch: Amazoneregenwoud), also known in English as Amazonia or the Amazon Jungle, is a moist broadleaf forest that covers most of the Amazon basin of South America. This basin encompasses 7,000,000 square kilometres (2,700,000 sq mi), of which 5,500,000 square kilometres (2,100,000 sq mi) are covered by the rainforest. This region includes territory belonging to nine nations. The majority of the forest is contained within Brazil, with 60% of the rainforest, followed by Peru with 13%, Colombia with 10%, and with minor amounts in Venezuela, Ecuador, Bolivia, Guyana, Suriname and French Guiana. States or departments in four nations contain "Amazonas" in their names. The Amazon represents over half of the planet's remaining rainforests,[1] and comprises the largest and most biodiverse tract of tropical rainforest in the world, with an estimated 390 billion individual trees divided into 16,000 species.

Sahara Desert dust windblown to the Amazon

More than 56% of the dust fertilizing the Amazon rainforest comes from the Bodélé depression in Northern Chad in the Sahara desert. The dust contains phosphorus, important for plant growth. The yearly Sahara dust replaces the equivalent amount of phosphorus washed away yearly in Amazon soil from rains and floods.[13] Up to 50 million tonnes of Sahara dust per year are blown across the Atlantic Ocean.[14][15] NASA Video.

NASA's CALIPSO satellite has measured the amount of dust transported by wind from the Sahara to the Amazon: an average 182 million tons of dust are windblown out of the Sahara each year, at 15 degrees west longitude, across 1,600 miles (2,600 km) over the Atlantic Ocean (some dust falls into the Atlantic), then at 35 degrees West longitude at the eastern coast of South America, 27.7 million tons (15%) of dust fall over the Amazon basin, 132 million tons of dust remain in the air, 43 million tons of dust are windblown and falls on the Caribbean Sea, past 75 degrees west longitude.[16]

CALIPSO uses a laser range finder to scan the Earth's atmosphere for the vertical distribution of dust and other aerosols. CALIPSO regularly tracks the Sahara-Amazon dust plume. CALIPSO has measured variations in the dust amounts transported— an 86 percent drop between the highest amount of dust transported in 2007 and the lowest in 2011.

A possibility causing the variation is the Sahel, a strip of semi-arid land on the southern border of the Sahara. When rain amounts in the Sahel are higher, the volume of dust is lower. The higher rainfall could make more vegetation grow in the Sahel, leaving less sand exposed to winds to blow