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Range; the Wahsatch Range; the Cascade Range; salt and alkali fields crossed by many the Sierra Nevada Range; the Coast Range. To mountain ranges, which vary in height. which of the great mountain systems of North America does each belong? (Page 113.)

The entire region has so little moisture Locate the Columbia Plateau. What river that the streams dry up and disappear. cuts it and drains it to the sea? What

Trees grow on some of the large tributary has this river?

mountains, but Trace the river and the tribu

many of them tary, describing

are bare to their courses as

their summits. you trace. The Colum

Sage brush bia Plateau

grows every was built up

where. In the of vast lava

warm southfloods from the

ern parts of

PIKES PEAK overflow of

the basin the volcanoes, which buried mountains almost thorny cactus and spiny yucca grow. to their summits a long, long time ago. It In the Great Basin are two great depressions, consists for the most part of

is cov- Death Valley and Mojave Desert—which lie severed with sage

eral hundred feet

below sea-level. brush and

Find them. grass, and

Locate the Col

orado Plateau. adapted to

What two rivers grazing. Many

unite to form the sections, espe.

Colorado River?

Trace the basin of cially in the

the Colorado. river valleys,

Trace the river

and its tributaare adapted to

ries, describing wheat-raising

each. The plateau is

The Coloradeeply cut by CACTUS & YUCCA

do plateau is the Columbia

cut up-disThese plants are peculiarly adapted to a dry climate. They have thick leaves River and its

and stalks which are very juicy. The juice is kept from drying out by the thick sected — by tributaries. outer covering of the entire plant.

the wearing Trace the low water-parting which separates action of the Colorado River and its the Columbia and Snake River basins from the few tributaries. The river has cut deep Basin Region. Trace the Basin Region. Locate the Great Basin in it. Locate Great Salt Lake. gorges or canyons through the red sand. Trace the Humboldt River; the Sevior River. stone plateau to the depth of more than Locate the Gila River Basin.

a mile. The climate is always so dry The Basin Region consists of vast that the wearing and weathering of the narrow valley sides are very slow; hence Between the high Sierras and the the walls of the canyon are almost perpenlow Coast ranges is the valley of Calidicular. (Page 83.) The highest parts fornia. It is drained to the sea by two of the plateau are covered with forests. rivers. Trace them. This is a rich There are many mesas, or remnants of and fertile valley, although much of what must once have been a much it is made so only through irrigation. higher rock plateau. (Page 71.) Great vineyards are cultivated for the You see that the

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production of wine great Western or

and raisins. (See pic Primary Highland,

ture on next page.) about which we

The Great Plains studied on page

extend eastward 112, descends to

from the Rockies, the Basin Region

merging into the as it extends

Valley of the northward AMERICAN HOME NEW MEXICO

Mississippi. from the Mex

The plains are ican Plateau.

broken by the From this ba

Black Hills, sin it rises

the Missouri again in the

Heights, the Columbia and

Ozark HighColorado Pla

land, and the teaus. The

dry Texan Rocky Moun.

Plateau. Find tains mark the

each. eastern, and

The amount

SPANISH HOME NEW MEXICO the Sierra Ne

of rainfall on vada and CasHOMES IN THE BASIN REGION.

these plains cade Mountains the western, boundary is so uncertain from year to year that of this vast region. The entire region grazing has been found to yield a is dry, but many sections yield abund. better and surer return in money than antly under irrigation. (Page 114.) other farm occupations. The Black

Many lanches and mining towns are Hills are forest-clad, and rich in minscattered throughout the greater part eral deposits. The Ozark Mountains of this region. Everywhere there is are noted for their lead ore. evidence of former volcanic action. Most Forests grow on the river banks and of the mountain peaks were once volcans on the higher parts of these plains. oes. Find and name some of these peaks. Trace the many streams which flow across

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