Monday, February 2, 2015

7th Science - 2/2/15


https://docs.google.com/document/d/1vqKvzMFk2jBrt_Ujx4O35oOsyPvNjBe9NZCGg5G8NoQ/pub

Homework:



2/5 - Copy vocabulary words in NB


1. Surface runoff is water, from rain, snowmelt, or other sources, that flows over the land surface, and is a major component of the water cycle. Runoff that occurs on surfaces before reaching a channel is also called overland flow.


2. Rill erosion - a scar or small channel on the side of a slope that was left behind by running water. It begins when small stream forms during a heavy rain.


3. Gully erosion - occurs when runoff water accumulates and rapidly flows in narrow channels during or immediately after heavy rains or melting snow, removing soil to a considerable depth.


4. Sheet erosion : erosion that removes surface material more or less evenly from an extensive area as contrasted witherosion along well-defined drainage lines that produces or enlarges gullies or ravines.


5. Drainage basin - is an extent or an area of land where surface water from rain, melting snow, or ice converges to a single point at a lower elevation, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean.




6. Meander - a winding curve or bend of a river or road.


7. Floodplain - an area of low-lying ground adjacent to a river, formed mainly of river sediments and subject to flooding.


8. Deltas - form from deposition of sediment carried by a river as the flow leaves its mouth. Over long periods, this deposition builds the characteristic geographic pattern of a riverdelta.


9. Alluvial fan - A fan-shaped accumulation of alluvium deposited at the mouth of a ravine or at the juncture of a tributary stream with the main stream.