Select the correct texts in the passage. Which two sentences best state the author's thesis?
from Canyons of the Colorado
by John Wesley Powell
The wonders of the Grand Canyon cannot be adequately represented in symbols of speech, nor by speech itself. The resources of the visual
arts are taxed beyond their powers in attempting to portray its phenomenal beauty. Language and illustration combined must fall. The
elements that unite to make the Grand Canyon the most sublime spectacle in nature are many and exceedingly diverse. The giant forms, which
result from the sculpture of tempests through ages too long for man to compute, are wrought into endless details. To describe these forms
would be a task equal in magnitude to that of describing the stars in the sky or the abundant beauties of the forest with its tracerles of foliage
presented by oak and pine and poplar, by beech and linden and hawthorn, by tulip and lily and rose, by fern and moss and lichen. Besides the
elements of form, there are elements of color. The rainbow is not more replete with hues. But form and color do not exhaust all the divine
qualities of the Grand Canyon. It is the land of music. The river thunders in perpetual roar, swelling in floods of music when the storm rains play
upon the rocks, and fading away in soft and low murmurs when the infinite blue of the sky is unveiled. With the melody of the great tide rising
and falling, swelling and vanishing forever, other melodies are heard in the gorges of the lateral canyons, while the waters plunge in the rapids
among the rocks or leap in great cataracts. Thus, the Grand Canyon is a land of song. Mountains of music swell in the rivers, hills of music billow
in the creeks, and meadows of music murmur in the rills that ripple over the rocks. Altogether it is a symphony of diverse melodies. All this is the
music of waters. The adamant foundations of the earth have been wrought into a sublime harp, upon which the clouds of the skies play with
mighty tempests or with gentle showers.