g SYSTEMS: AND: BASINS. ee

Should you like to see hot water spout out
of the ground? . It often shoots up as high
as a very tall tree. There must be a very hot
place in the earth under the geyser.

From some springs there is a gentle flow of
warm or hot water. Find the picture of the
hot springs.
made many pretty basins ?

16. Where Brooks Flow.

Why do brooks flow in creoked lines ?

In what direction does every stream flow ?

Why are some brooks swift and others slow ?

Why is a brook wider in some plage than in
others ?

What are the uses of brooks and eae ue

17. Systems and Basins.

Streams often flow from many small valleys
into a large valley.

All the streams that meet in one valley
form a system. A river system includes the
main river of the valley, and all the rills,
brooks and rivers that flow into the main

one.
All the land that sends water to a brook

 

 

A Divide.

Do you not think that shee have :

forms the basin of the brook. A basin is
made of slopes.

Every stream is in a basin. <A river basin
includes all the land that is drained by a
river system.

q

Sy

Mississippi System.

Every large basin is made of many small
ones.

Many brook basins send water to one river.
A large river basin often includes many
smaller river basins.

The Mississippi system drains about a
million square miles of land. This vast tract
of land forms the Mississippi basin.

The main stream of this system is the
longest river on earth.

How does a basin differ from a system?
Poimt to the basins and systems in the pic-
ture on the opposite page.

s

18. The Top of a Ridge.

Here is a picture of a ridge that rises between
two long narrow valleys.

When rain falls on the top of this midge, into which
valley does it flow ?

What part of the ridge is in each valley ? :

Point to the line that runs along the very top of
the ridge. This line is called a divide. It divides
the valleys.