Social Studies: Classroom resource for Class 7, Geography

Reading Time: 1 minutes

Class 7 students should be able to understand different components of the environment and recognize that the environment as a combination of natural and human made phenomena. This video shows how the environment can be modified due to both human and natural changes.

When wolves were reintroduced to Yellowstone National Park in the United States after being absent for nearly 70 years, the most remarkable thing happened. They set off a series of changes that led to changes in the rivers.

Suggested questions for classroom discussion based on the video:

  • Wolves kill many animals but also give life to many others. Are there other similar examples of this in the animal world?
  • How did the presence of the wolves change the behaviour of the deer? What happened as a result of this?
  • What happened due to an increase in vegetation?
  • Outline the sequence in which changes took place from when the wolves were introduced to when the rivers started to change to understand how the environment was modified.

By Diana Romany — Educational Specialist (Member of Test Development Team)


Originally published at on July 8, 2015.

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