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among the terrestrial planets the earth is unique in having abundant liquid water. both mercury and the earth's moon are too small to retain water and venus because of its runaway greenhouse effect is too hot to retain surface water (it is gaseous instead of liquid). mars has only some frozen water and trace amounts of water vapor in its atmosphere. in marked contrast 71% of the earth's surface is covered with water and a small but important quantity of water vapor is present in its atmosphere. despite the importance of running water as an agent of erosion sediment transports and deposition its role is limited in some areas. in areas covered by glacial ice such as greenland and antarctica running water is currently not important. some parts of deserts are also little affected by running water. even in most desert regions though the effects of running water are manifest although the channels are dry most of the time.
although the quantity of water in streams is small at any one time during the course of a year very large volumes of water move through stream channels. in fact water is continually recycled from the oceans through the atmosphere to the continents and back to the oceans. this continuous recycling of water is called the hydrologic cycle. water possesses no strength so it will flow on any slope no matter how slight. the flow of water or any other fluid can be characterized as laminar or turbulent. in laminar flow lines of flow called streamlines are all parallel with one another. in other words all flow occurs in parallel layers with no mixing between layers. by contrast in turbulent flow the streamlines intertwine causing a complex mixing of the fluid.
among the terrestrial planets the earth is unique in having abundant liquid water. both mercury and the earth's moon are too small to retain water and venus because of its runaway greenhouse effect is too hot to retain surface water (it is gaseous instead of liquid). mars has only some frozen water and trace amounts of water vapor in its atmosphere. in marked contrast 71% of the earth's surface is covered with water and a small but important quantity of water vapor is present in its atmosphere. despite the importance of running water as an agent of erosion sediment transports and deposition its role is limited in some areas. in areas covered by glacial ice such as greenland and antarctica running water is currently not important. some parts of deserts are also little affected by running water. even in most desert regions though the effects of running water are manifest although the channels are dry most of the time.
although the quantity of water in streams is small at any one time during the course of a year very large volumes of water move through stream channels. in fact water is continually recycled from the oceans through the atmosphere to the continents and back to the oceans. this continuous recycling of water is called the hydrologic cycle. water possesses no strength so it will flow on any slope no matter how slight. the flow of water or any other fluid can be characterized as laminar or turbulent. in laminar flow lines of flow called streamlines are all parallel with one another. in other words all flow occurs in parallel layers with no mixing between layers. by contrast in turbulent flow the streamlines intertwine causing a complex mixing of the fluid.
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