Surface Water
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Transcript Surface Water
“Where’s Water?” Unit: Surface Water
Rivers, Lakes, and Ponds
River Systems
The streams and smaller rivers that feed into
a main river are called tributaries
Tributaries flow downward toward the main
river, pulled by the force of gravity
A river and all its tributaries together make
up a river system
River Features
Headwaters
Tributaries
Flood plain
Oxbow lake
Meander
Mouth
Delta
Estuary
River Features
The many small streams that come together
at the source (beginning) of a river are
called its headwaters
The steep slope of the land causes the river
to flow quickly
River Features
Meanders-looping curves in a river
Meanders can curve back on themselves.
The river may then cut a new, straight
course, eventually leaving an oxbow lake
Horseshoe
Bend
of the Colorado River
near Page, AZ
Ox Bow lake on Mississippi
River Features
The broad, flat valley through which a river
flows is its flood plain
River Features
The mouth of a river is where the river
flows into another body of water
A delta is created when the river slows
down and deposits the sediment it was
carrying
Delta Formation
DEPOSITON OF MATERIAL BY THE RIVER
WHEN IT ENTERS THE SEA
Mississippi Delta from Space
MISSISSIPPI
Watersheds
The land area that supplies water to a river
system is called a watershed
Watersheds are sometimes known as
drainage basins
We live in the Delaware River Watershed
Divides
A ridge of land that separates one watershed
from another is called a divide
Mountains are an example of a divide
Divides
Estuaries
An
estuary is a
coastal inlet or
bay where fresh
water from rivers
mix with salty
ocean water
River Features Practice
Mississippi River
Place a box around a tributary
of the Mississippi River
Identify a tributary of a tributary of
the Mississippi River
Put a X around the Headwaters of
the Mississippi River
Circle a meander of the
Mississippi River
Circle an Oxbow Lake along
the Mississippi River
Name a state that is in the flood
plain of the Mississippi River
Put a star at the mouth of the
Mississippi River
Put a star at the mouth of the
Missouri River
Put a star at the mouth of the
Ohio River
Shade in an area of the
Mississippi River Watershed
Identify a divide of the
Mississippi River Watershed
Mississippi River Features
What is this land
formation at the mouth
of the Mississippi
River called?
The fresh water of the
Mississippi River
mixes with the salt
water of the Gulf of
Mexico and enters the
Atlantic Ocean. What
is the term for fresh
water mixing with salt
water?
Surface Water Part II:
Ponds and Lakes
Ponds
Ponds are
freshwater
Ponds are shallow
Ponds form when
water collects in
low-lying areas of
land
Plants grow at the
bottom of ponds
Lakes
Lakes are
freshwater
Lakes are deep
Lakes form when
water collects in
low-lying areas of
land
Plants do not grow
at the bottom of
deep lakes
Lake Baikal, Russia
Lake Formation
Lakes can be formed by natural processes or
human efforts:
1. Volcanic lakes
2. Glacier- made lakes
3. Human- made lakes
A lake
that stores water for human use
is called a reservoir
Volcanic Lake
Glacier-Made Lakes
Human-Made Lakes
Lakes Can Change
Seasonal
changes- water
temperature at different depths
changes during the year
Lake turnover-nutrients mix
Nutrients-substances such as
nitrogen and phosphorous that
plants and algae grow
Lakes Can Change
Long-term changes
Eutrophication-Algae
and scum
forms on the surface of the water
becomes so thick that it blocks out
sunlight and plants cannot carry out
photosynthesis
Death of a body of fresh water
Eutrophication
Eutrophication
Ponds and Lakes
SAME
DIFFERENT
Freshwater
Lakes are deeper
Still, standing water
Plants don’t grow at
the bottom of deep
Form when water
lakes
collects in hollows and
low-lying areas of land Sunlight cannot reach
the bottom of a deep
lake and
photosynthesis cannot
occur
Crater Lake and Lake Nyos Links
http://en.wikipedia.org/wiki/Crater_lake
http://news.bbc.co.uk/onthisday/hi/dates/sto
ries/august/21/newsid_3380000/3380803.st
m