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earth b

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In the diagram, above, marker A is pointing to a __________, which is formed by water eroding away soft rock around harder rock, creating a steep drop-off.
c.
waterfall
In the diagram, above, marker F is pointing to a __________, which are formed when meanders wear away at a narrow point and a pool of water forms.
b.
oxbow lake
In the diagram, above, marker B is pointing to a __________, which is a small stream or river that runs into a larger stream or river.
a.
tributary
What five factors determine the amount of runoff in an area?
The five main factors that determine the amount of runoff in an area are the amount of rain, vegetation, type of soil, shape of the land, and how people use the land.
Compare and contrast the features of a river near its source and far down along its course.
Near its source, a river is fast moving and flows on a steep mountain slope. It rapidly erodes a V-shaped, steep-sided valley. Its course may include waterfalls and rapids. Farther along its course, a river flows over gently sloping land. Here it flows more slowly, spreading out and eroding the land to form a wide, flat valley. As the river begins to wind from side to side, meanders form.
In the diagram, above, marker D is pointing to a __________, which is a landform that forms when a river slows down as it flows into an ocean or lake. As the river slows, it drops its sediment load, gradually creating a network of small channels and islands.
d.
delta
Explain how water erosion by groundwater can form a cave.
Groundwater can cause erosion through chemical weathering. First, water that sinks into the ground mixes with carbon dioxide to form carbonic acid, a weak acid. Carbonic acid can break down limestone. Some of the limestone changes chemically and is carried away in a solution of water. This gradually hollows out pockets in the rock. Over time, these pockets develop into large holes underground—caves or caverns.
In the diagram, above, marker E is pointing to a __________, which is the "winding" shape that a river can take and its shape is determined by the hardness of the rock the flowing water meets.
d.
meander
The deposition of sediment where there is a steep drop-off into shallow, flat land can create a(n) __________.
c.
alluvial fan
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