The Carving of Hells Canyon
When most people think of deep, awe-inspiring gorges in North America, their minds immediately drift to the Grand Canyon in Arizona. However, tucked away along the border of Idaho and Oregon lies a dramatic chasm that actually claims the title of the continent's deepest river gorge: Hells Canyon. Plunging more than a mile and a half downâreaching a maximum depth of 7,993 feet from the peak of He Devil Mountain to the rushing waters belowâthis spectacular canyon is a testament to the immense power of geological forces and running water. The story of how Hells Canyon was formed is a complex tale spanning hundreds of millions of years, involving colliding tectonic plates, massive volcanic eruptions, and a catastrophic ancient flood.
- Accretion:
- The geological process by which landmasses, such as islands or crustal fragments, are added to a tectonic plate over time through collision and fusion.
- Basalt:
- A dark, dense volcanic rock formed from the cooling and hardening of molten lava flows.
- Gradient:
- The degree of steepness of a slope, such as the tilt of a riverbed that determines the speed and force of flowing water.
- Abrasion:
- The mechanical scraping or wearing away of rock surfaces by friction, typically caused by water carrying sand, gravel, and boulders.
- Strata:
- Layers of rock or sediment piled on top of each other, representing different periods of geological history.
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Preview questions from this passageShowHide
- 1What is the maximum depth of Hells Canyon, and from what peak is this measured?
- 2Where did the oldest metamorphic and volcanic rocks at the bottom of Hells Canyon originally form?
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About this explanatory article passage for Middle School
âThe Carving of Hells Canyonâ is a explanatory article reading passage about Geological Formations, written for Middle School. It takes about 4 minutes to read (557 words) and comes with an interactive quiz and a printable worksheet with comprehension questions and an answer key.