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Chapter 1 - Lesson 2 Streams and Rivers, Lakes

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Chapter 1 - Lesson 2 Streams and Rivers, Lakes Chapter 1 The Earth s Bodies of Water Water covers more than 70% of the Earth Water is in the ground and in the air ... – PowerPoint PPT presentation

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Title: Chapter 1 - Lesson 2 Streams and Rivers, Lakes


1
Chapter 1 - Lesson 2 Streams and Rivers, Lakes
  • Chapter 1
  • The Earths Bodies of Water

2
Streams and Rivers page 26
  • Water covers more than 70 of the Earth
  • Water is in the ground and in the air we breathe
  • People, Plants, and Animals all need water to
    live

Weathering - is the process of breaking up rocks
into smaller pieces called sediment
3
Streams and Rivers
  • Streams are bodies of water that flow over land
    in a channel
  • Most streams begin on high ground, among hills or
    mountains
  • The sources of a stream usually consist of
    melting snow/ice or an overflowing lake
  • At the end of a stream is the mouth which empties
    into another body of water

4
Streams and Rivers
  • Streams can be as small as a shallow brook
  • Or as large as a river, the largest and most
    important streams
  • Most rivers form from many smaller streams coming
    together, these are called tributaries

Tributaries are streams or rivers that flow
into a larger stream or river
5
Streams and Rivers
  • The more tributaries that empty into a river the
    larger the river grows
  • Together the river and its tributaries are called
    a river system

River System a river and all of its tributaries
6
Streams and Rivers
  • Each continent, except Antarctica, has major
    rivers and river systems.
  • Africa has the Nile, Asia has the Yangtze,
    Australia has the Murray, Europe has the Danube,
    North America has the Mississippi, and South
    America has the Amazon

7
Streams and Rivers, Lakes
  • The Nile is the Earths longest river, it flows
    from Central Africa to the Mediterranean Sea
  • The Amazon is the Earths largest river, carrying
    more water than the Mississippi, Nile and Yangtze
    combined
  • River Systems carry or drain water away from the
    land around them (drainage basin)
  • Rivers are important for many reasons including
    drinking, cleaning, travel and trade

Drainage Basin Land drained by a river system
8
Streams and Rivers
Drainage Basin
9
  • Why did many of the worlds first settlements
    form along rivers?
  • (pg.27)

10
Lakes
  • Lakes are bodies of water surrounded by land
  • The word lake comes from the Greek language
    meaning hole because most lakes are holes in the
    Earth that fill with water
  • Lakes exist on every continent except Antartica
  • The greatest amount of lakes exist where there
    was once many glaciers such as North America and
    northern Europe

11
Lakes
  • During the last Ice Age, glaciers gouged huge
    holes in the Earth and the holes filled with the
    water from the melted glaciers
  • Lakes also form where rainwater collects in huge
    holes made in other ways
  • Crater Lake in Oregon was formed in a crater of
    an extinct volcano

12
Lakes
  • Lake Baikal in Russia is the deepest lake on
    Earth measuring 5,315 feet deep it was formed in
    a huge crack in the Earths crust called a rift

Rift a long and deep crack in the Earth
13
Lakes
  • North America has the most lakes out of all of
    the continents
  • The largest of the North American lakes are the
    Great Lakes
  • One fifth of all of the fresh water on the
    Earths surface is found in the Great Lakes

H Huron O Ontario M Michigan E Erie S
Superior
14
Lakes
  • There are some large bodies of water called seas
    that are actually lakes
  • The difference is that they are not fresh water,
    but salt water and that is why they are called
    seas instead of lakes
  • The Dead Sea, Sea of Galilee, and the Caspian Sea
    are lakes
  • The lowest lying lake is the Dead Sea between
    Israel and Jordan
  • The highest lake is Lake Titicaca in South America

15
Lakes
The Dead Sea
16
Lakes
Lake Titicaca
17
Lakes
  • Not all lakes are made by nature
  • Some are man-made and are called resevoirs
  • People build dams to control river flooding or to
    generate electricity

Reservoir a lake that forms behind a human made
dam
18
Terms to Know
  • Reservoir
  • Rift
  • Drainage basin
  • River system
  • Tributaries
  • How did Ice Age glaciers form lakes in North
    America and Europe? (pg. 28)
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