describe how landforms are created through a combination of destructive and constructive processes?
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Constructively, most landforms boil down to tectonics, which builds mountains, diverts streams, and shifts climate.\n\nThe #1 destructive force by far is erosion.
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In a phrase, volcanic rock.\n\nEach volcano erupts constructively and destructively, and some of those constructive eruptions build the sides of the volcano.  The type of magma determines the color and shape.
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This is a great way to begin understanding the different forces that shape the land.  It is important to remember how the rocks came to be found, Metamorphic rocks from Michigan that may have been dug up from a deep quarry or found on the surface exposed by glacial action.  In N Carolina they could be sedimentary rocks exposed by water erosion.  In Florida they could very likely be calcium carbonate deposited by ancient coral reefs.  A simple understanding of these and other rock forming processes would make a prize winning 4th grade report.  Good Luck!
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For thousands, even millions of years, little pieces of our earth have been eroded--broken down and worn away\nby wind and water. These little bits of our earth are washed downstream where they settle to the bottom of the rivers, lakes, and oceans. Layer after layer of eroded earth is deposited on top of each. These layers are pressed down more and more through time, until the bottom layers slowly turn into rock.
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From what choices? There are a few erosion processes connected to glacial erosion. \nRock Failure\nPlucking\nAbrasion\nand even fluvial erosion called glaciofluvial erosion.\n\nHere are some examples:
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The hydrolic cycle is the main cause of erosion.  Rain soaks into the ground.  To much rain can saturate the ground with water, and if there are not enough plants the rain soaked land can be too heavy and you will get mud slides.  Rain also forms runoff in the forms of streams, creeks, rivers and deltas.  Erosion occurs in all these forms of runoff.  It can be good because minerals are pulled from the dirt and redistributed for better farm land.  However erosion can also cause disasters like what happened in New Orleans after Katrina.  Erosion had caused the entire city to sink below sea level, so when the dikes collapsed the water flooded the city.
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It is very hard to understand what you are asking. Since groundwater is beneath the surface of the earth, it would generally not be considered to have 'landforms'. However, if there are any landforms in the water table they are what are called phreatic caves. These are caves that exist below the water table. Another sort of 'landform' that might exist within groundwater, or beneath the water table are the buried sedimentary features that exist within most sedimentary rocks. Examples of these would be sand bars, deltas, river channels, natural levees, carbonate platforms, incised valleys, alluvial fans, and just about any geomorphic feature that exists on the surface. \n\nAnother way to understand your question would be that perhaps you are asking about how surface landforms affect groundwater. The water table is often elevated under higher topographic features such as hills. Often there is a hydrostatic gradient where water is slowly moving through saturated aquifers downward toward valleys. This type of flow can even create artesian springs.
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Landform is a very nebulous term that refers to any distinct topographical feature: mountains, valleys, rivers, plateaus, etc.  So, a famous landform in Asia would be the Mt. Everest.
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Deltas and Estuaries are created at the mouths of rivers.\nAnother landform that is created close to the mouth of a river is an ox bow lake.
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Dams and levees change the course of rivers.  Farmig, forestry, and suburban development lead to erosion.  Mining can change the forms of mountains.
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*Pondering a long time on this* My visual description would be http://en.wikipedia.org/wiki/Image:Escher_Waterfall.jpg\n\nScientifically, A waterfall is usually a geological formation resulting from water, often in the form of a stream (or river) flowing over an erosion-resistant rock formation that forms a sudden break in elevation. Some waterfalls form in mountain environments where erosion is rapid and stream courses may be subject to sudden and catastrophic change. In such cases, the waterfall may not be the end product of many years of water action over a region, but rather the result of relatively sudden geological processes such as thrust faults or volcanic action. Waterfalls may also be artificial.\nGreat waterfall info at http://en.wikipedia.org/wiki/Waterfall\n\nMy personal description, absolutely lovely...
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There are a couple ways. Hot spots can build up islands through volcanic activity, like Hawaii. Some islands can be created by subduction volcanism (Japan). Other islands can be uplifted at convergent or possibly transverse plate boundaries.\n\nIslands can also be created by erosion and inundation, as in a case of sea level rise where the water covers low lying areas while higher areas get "separated" from the land by water (St. Lawrence Island in Alaska). Glaciers can scour channels around large land masses, then recede and the channels can become filled with water to surround the land masses and make them islands. Manhattan Island was actually created by a continental glacier pushing a bunch of sediment out into the ocean and then receeding (it is a moraine).\n\nSome islands can be created purely by sediment deposition, such as those at the mouths of deltas. \n\nScleractinean coral will also form islands (atolls) even as the land around them recedes because they require sunlight to live. Coastal erosion is also known to produce offshore bars which, if big enough, can be vegetated and become islands.\n\nRivers can also meander around bits of land on the floodplain and cut them off from the rest of the earth, forming islands.
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Over time, a stream system achieves a particular drainage pattern to its network of stream channels and tributaries as determined by local geologic factors. Drainage patterns or nets are classified on the basis of their form and texture. Their shape or pattern develops in response to the local topography and subsurface geology.
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1. Yes and no.  Sand comes from rocks.  Metamophic rocks are shaped by extreme pressure which is responsible for some of the patterns you might see in rocks.  \n2. Yes.
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When it rains and the rain hits mountains or other materials it cannot sink through small trickles appear in the direction of the downslope. The trickles come together eventually and pour looser materials with them (such as sand or loose earth for example). Eventually they can form a big enough stream to be a river. When a river runs with high speed it tends to have a straighter path, but if it becomes wide and slow it starts bend like a serpentine.
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The wind blows sand and rubble. Erosion might also cause the land to shift.
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1 Deposition\n2 Compaction\n3 Cementation