Chapter 6 The lithosphere and the hydrosphere
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1 Chapter 6 The lithosphere and the hydrosphere
2 The lithosphere shell of the Earth, consists of crust and upper mantle contains minerals and rocks
3 1. Minerals solid, inorganic substances with defined composition and properties exist naturally made of identically shaped crystals Classified in 4 ways: 1. Colour a) idiochromatic (always the same colour, red ruby) b) allochromatic (can take on different colours, quartz) 2. Transparency objects can be transparent, translucent or opaque 3. Hardness Mohs scale, a mineral can scratch anything below it 4. Streak when rubbed on porcelain, minerals leave a trace of powder colour depends on type Mining of minerals ore is extracted from lithosphere (rock containing mineral), then separated Quebec has many mineral deposits (gold, copper, zinc, nickel, iron)
4 2. Rocks heterogeneous solids made of many minerals can be used for decoration, building, insulation 3 types: 1. Igneous: formed when magma cools and solidifies 2. Sedimentary: formed by accumulation and compression of debris under water, layers 3. Metamorphic: igneous or sedimentary rocks transformed by heat or pressure
5 3. Soil comes from rock that breaks down over time (frost, wind) and decomposing organic matter 200 years to form a layer of soil 1 cm thick! 5 soil horizons (layers): 1. organic matter (decomposing animals and plants) 2. topsoil (humus and minerals, supports plant life) 3. subsoil (small mineral particles, trees get nutrients here) 4. fragmented parent rock (chunks of rocks formed from layer below) 5. unaltered parent rock (starting point for soil formation) Fertility of soil depends on: 1. presence of minerals 2. adequate moisture 3. appropriate ph
6 4. Sources of energy in the lithosphere a) Fossil fuels result from the transformation of organic matter includes coal, natural gas and oil natural gas and oil are produced when organisms die, sink to bottom of ocean and are compressed over time coal is formed from trees that once grew in swamps, over time they were buried and compressed when fossil fuels are burned they produce CO 2 and CH 4 (greenhouse gases) b) Uranium splitting the atom allows a huge output of energy (one handful provides as much energy as 70 tonnes of coal) nuclear reactors need to cool waste and then bury it risk of accidents is a constant concern (radioactivity) c) Geothermal energy from the internal heat of the Earth a fluid is circulated deep underground, heated, and then returns to surface used mostly in volcanic regions of world
7 The hydrosphere outer layer of water on Earth, includes liquid, solid, gas
8 1. Inland waters and watersheds inland waters are fresh water, include lakes, rivers, groundwater watersheds are areas where inland waters drain into the same larger body of water water flow is influenced by topography, geology, climate, vegetation, development. Quebec has 3 watersheds
9 2. Oceans Pacific, Atlantic, Indian, Arctic and Southern Oceans water temperature determined by : a) depth: below 200 m temperature drops drastically (thermocline zone) b) seasons c) latitude (warmer around equator) ocean circulation is caused by ocean currents a) surface currents are caused by wind, move horizontally b) subsurface currents caused by density and salinity (colder and saltier = more dense) c) thermohaline circulation is the combination of both (conveyor belt responsible for regulating global climate)
10 3. The cryosphere (frozen water) pack ice is the ice floating on the oceans near the North and South poles global warming has caused Arctic ice pack to shrink significantly glaciers are masses of ice on land when chunks break off and fall into the sea they create icebergs this causes a rise in sea level when ice melts salinity is affected, water becomes less dense, could have an impact on ocean currents and therefore global climate
11 4. Energy resources of the hydrosphere hydraulic energy is derived from moving water in Quebec the energy from the flow in rivers is converted to electrical energy renewable, no greenhouse gases emitted, but severe damage to ecosystems waves and ocean currents can also be used to transform energy
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