firn, Grainy, icy snow left over from previous seasons., firn basin, Basin high in the mountains where snow builds up over time., glacial age, A cold period in which the land is covered by vast ice sheets., glacial river, River that is fed by meltwater from a glacier., glacier, Large body of ice that slowly moves down a slope., glacier portal, Opening in a glacier from which meltwater flows., glacier tunnel, Tunnel that forms under a glacier when meltwater accumulates there., ground moraine, Sediment that builds up under a glacier and is left behind when it melts., high-pressure power plant, A power plant where falling or fast-flowing water is used to generate electricity, often located in the mountains., hydroelectricity, Electricity generated by water power., ice age, A cold period in which the land is covered by vast ice sheets., interglacial period, Warmer period between two ice ages., lateral moraine, Debris that collects along the sides of a glacier., mixed river, River that is fed by both rainwater and meltwater from a glacier., precipitation, Water from the atmosphere that falls to the ground as rain, snow or hail., terminal moraine, Crushed rock and debris that is carried along by a glacier and left behind after the glacier melts., U-shaped valley, Valley in the shape of a ‘U’ that was eroded away by a glacier.Also called a trough valley., upper reaches, The first part of a river near the source., V-shaped valley, Valley in the shape of a ‘V’ that was eroded away by a river..

Chapter 2, section 2

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