A lake (from Latin lacus) is a terrain
feature, a body of water that is localized to the bottom of basin. A body of water is considered a lake
when it is inland, is not part of an ocean, is larger and
deeper than a pond,
and is fed by a river.[13][14]
Natural lakes on Earth are generally found in mountainous
areas, rift
zones, and areas with ongoing or recent glaciation. Other
lakes are found in endorheic basins or along the courses of mature
rivers. In some parts of the world, there are many lakes because of chaotic
drainage patterns left over from the last Ice Age. All
lakes are temporary over geologic time scales, as they will slowly fill in with
sediments or spill out of the basin containing them.
A river is a natural watercourse,[11]
usually freshwater,
flowing toward an ocean,
a lake, a sea or another river. In
a few cases, a river simply flows into the ground or dries up completely before
reaching another body of water. Small rivers may also be termed by several
other names, including stream, creek and brook. In the United
States a river is generally classified as a watercourse more than 60 feet
(18 metres) wide. The water in a river is usually in a channel, made up of a stream bed
between banks.
In larger rivers there is also a wider floodplain
shaped by waters over-topping the channel. Flood plains may be very wide in
relation to the size of the river channel. Rivers are a part of the hydrological cycle. Water within a river is
generally collected from precipitation through surface
runoff, groundwater recharge, springs, and the release of water stored in glaciers and
snowpacks.
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