Look at the picture of the fragmented rock. What has most likely caused it to break up like it is?

The authors use the word “backbone” in lines 3 and 39 to indicate that

Winds are formed from the sun's uneven heating of the earth's atmosphere. the wind patterns are altered by bodies of water, different landforms, and plant cover. because of this, the wind is considered a form of

Why are metamorphic rocks formed by contact metamorphism usually not dense or resistant?