Environmental Diversity, resources, hazards of Latin America

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Presentation transcript:

Environmental Diversity, resources, hazards of Latin America Subtitle

Physiography

Notice altitudinal differences In highlands Notice altitudinal differences In highlands. Andes Mountain chain Patagonian Highlands Brazilian Highlands Guyana Highlands Central Lowlands

Andes Volcanic chain of mountains; many active The only mountains that are taller than the Andes are the Himalaya Mountains and their adjacent ranges, including the Hindu Kush. The average elevation in the Andes is about 13,000 feet ; highest elevation in the Andes is Mount Aconcagua in Argentina, which is 22,841 feet (highest peak in Rockies is 14,000 ft) Volcanic chain of mountains; many active

subduction Earth’s crust us divided into large plates that move slowly. Plates are enormous slabs of rock. When they are forced to move against one another, earthquakes are generated. When the plates are forced to sink beneath continents, they go to depths where the internal temperature is high and the plates melt. The molten rock then comes up to the surface in volcanoes. Andes is volcanic mountain cahin caused by subduction

Altitudinal zonation Temperature drops 3.5 degrees (F) for every 1000 ft gain in elevation In each elevation zone, Climate, vegetation, agriculture, lifestyles vary.

Latitudinal differences for tierra caliente

Tierra Nevada (permanent snow and ice) No permanent human occupants When some snow/ice melt, keeps water reserves high Tierra Helada 12000 – 15000 ft. “páramo” in northern Andes; “puna” in Andes of Peru and Bolivia Mining, herding of sheep, llamas, alpacas Deer, vicuña, guanaco (wild) Vicuna and guanaco are wild

Tierra Fria: 6000 – 12000 ft. Lower elevations: maize and beans; higher elevations: tubers (potatoes) Sheep herding, wheat, barley, broad beans, alfalfa, fruit trees, dairy cows Major population centers: Bogotá, Colombia Quito, Ecuador La Paz, Bolivia Sucre, Bolivia Cuzco, Peru

Tierra Templada 2500 – 6000 ft. Absence of frost (much of Central America is in this altitudinal zone) Coffee and cacao Sugar cane, citrus, cotton, tomatoes, sweet potatoes, squash, maize

Tierra Caliente (sea level to 2500 ft.) Year-round high temps High diversity; disease and pest problems Cacoa, manioc (cassava), sweet potatoes, peanuts

Climate change in andes Slides Glaciers (important source of meltwater for pastures and drinking) are receding Tierra Helada is getting smaller Used for llama; now grain is growing there Rainfall patterns are changing Potato Park

Biodiversity 7% global area; 50% species Most species not yet identified

Carbon cycling Forests store carbon Released into atmosphere when burned 15% total CO2 is from land-use change, predominantly deforestation. If forests are not replaced, carbon release is permanent. Tropical forests have capacity to absorb atmospheric CO2. Do 20% global photosynthesis Amazon uptake = 10% global emissions Removing forests removes this uptake ability

Effects on hydrologic cycle: Deforestation decreases precipitation in Amazon interior Prevailing wind forest Atlantic forest Atlantic evapotranspiration evaporation (interior) Amazon basin Atlantic Ocean