kwizNET Subscribers, please login to turn off the Ads!
Email us to get an instant 20% discount on highly effective K-12 Math & English kwizNET Programs!

Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Middle & High School - Reading Comprehension
3.2 Waterfalls

Directions: Use the SQRW (Survey-Question-Read-Write) Strategy to read the following informational article. Answer the questions and have the notes you have taken while reading this article reviewed by your parent or teacher.

Waterfalls

A waterfall is usually a geological formation resulting from water, often in the form of a stream, flowing over an erosion-resistant rock formation that forms a sudden break in elevation. Waterfalls may also be artificial, and they are sometimes created as garden and landscape ornament.

Some waterfalls form in mountain environments where erosion is rapid and stream courses may be subject to sudden and catastrophic change. In such cases, the waterfall may not be the end product of many years of water action over a region, but rather the result of relatively sudden geological processes such as thrust faults or volcanic action.

Typically, a stream flow across an area of formations strata will form shelves across the streamway, elevated above the further stream bed when the less erosion-resistant rock around it disappears. Over a period of years, the edges of this shelf will gradually break away and the waterfall will steadily move upstream. Often, the rock strata just below the more resistant shelf will be of a softer type, and will erode out to form a shallow cave-like formation known as a rock shelter (also known as a rock house) under and behind the waterfall.

Waterfalls can also form due to glaciation, whereby a stream or river flowing into a glacier continues to flow into a valley after the glacier has receded or melted. The large waterfalls in Yosemite Valley are examples of this phenomenon.

Streams often become wider and more shallow just above waterfalls due to flowing over the rock shelf, and there is usually a deep pool just below the waterfall due to the kinetic energy of the water hitting the bottom.

(Source: Wikipedia.org)

Q 1: Some waterfalls are created over time. What circumstances happen that create a rapid waterfall?
Glacier melting.
All waterfalls are the end product of many years of water action over a region.
Sudden geological processes such as thrust faults or volcanic action.
Temperature fluctuations.

Q 2: What causes a deep pool just below the waterfall?
The motion of the water hitting the bottom.
The shelves.
The non-erosive material.
The rain.

Q 3: What is an example of waterfalls created due to glaciation?
Glacier National Park.
Grinnell Glacier.
Yosemite Valley.
Trummelbach Falls.

Q 4: In what situations might someone artificially create a waterfall?
To recreate rainforests.
To help water plants.
To create an ecological experiment.
For garden and landscape ornaments.

Question 5: This question is available to subscribers only!

Question 6: This question is available to subscribers only!


Subscription to kwizNET Learning System offers the following benefits:

  • Unrestricted access to grade appropriate lessons, quizzes, & printable worksheets
  • Instant scoring of online quizzes
  • Progress tracking and award certificates to keep your student motivated
  • Unlimited practice with auto-generated 'WIZ MATH' quizzes
  • Child-friendly website with no advertisements
  • Choice of Math, English, Science, & Social Studies Curriculums
  • Excellent value for K-12 and ACT, SAT, & TOEFL Test Preparation
  • Get discount offers by sending an email to discounts@kwiznet.com

Quiz Timer