Yosemite Nature Notes 10: Rock Fall

The video explores rock falls in Yosemite Valley, highlighting their causes, dynamics, and historical occurrences. It discusses the impact of rock falls on the landscape and visitors, emphasizing the importance of research and safety measures. The challenges of predicting rock falls are compared to earthquake prediction, underscoring the complexity of the task.

What has been the major force shaping the Yosemite Valley landscape since the glaciers retreated?

• Volcanic activity

• Wind erosion

• Water erosion

• Rock falls

Which of the following is NOT a potential trigger for a rock fall?

• Heavy rain

• Snowstorm

• Earthquake

• Sunny day

What happens to the boulders after they detach from the cliff face during a rock fall?

• They dissolve in the air

• They float down gently

• They remain stationary

• They free fall and spin

What was the condition of the slope before the rock fall in August 2009?

• Covered with large oak trees

• Barren and rocky

• Filled with small shrubs

• Covered with water

Why are rock falls in Yosemite Valley of more than just scientific interest?

• They occur in a remote area

• They are a rare phenomenon

• They happen in a popular tourist area

• They are easy to predict

How many people have died from rock falls in Yosemite National Park in the last 150 years?

• 5

• 15

• 50

• 150

What is one of the scientific methods used to study rock falls in Yosemite?

• Botany

• Laser scanning

• Meteorology

• Astrology