The glaciers act as water reservoirs that supply many of the Earth’s large rivers. When glaciers retreat, stronger fluctuations in river levels are to be expected locally. Taking this into consideration, think about what economic impacts might be expected in the Rhine region from the melting of the Alpine glaciers. Where appropriate, use a different example of an important river and its associated area

e al g As part of global climate change, the Earth is warming. If a region that currently supports a temperate forest warms considerably but does not change in precipitation, what biome is it expected to support? Annual precipitation (cm) 400 300 200 100 Boreal forest Desert Grassland 30 Savanna Tropical rainforest Tropical seasonal forest Tropical thorn scrub and woodland Desert 20 Temperate rainforest Temperate forest Savanna 10 Boreal forest Grassland Average temperature (°C) 0 Tundra -10

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Place the following components of the hydrologic cycle in the correct order by numbering them from 1 to 5, beginning with precipitation. a. precipitation b. uptake by plants c. transpiration d. water percolation into soil e. condensation

The dams that have been built on most rivers (two-thirds of the world's rivers do not run free) often stabilize river flow by increasing flows below the dams during droughts and degreasing the amount of flooding during periods of high rainfall. Using the intermediate disturbance hypothesis , predict how stabilizing flows would affect the diversity of river organisms below reservoirs .

Terrestrial NPP   a. generally increases with temperature.   b. does not vary with precipitation.   c. is high when soils are low in nutrients.   d. is high in dry regions.

Most North American has been converted to cropland O tundra O prairie O boreal forest O desert