Understanding Elevations and Sea Level

This video tutorial explains how to describe elevations using positive and negative numbers. It introduces the concept of sea level as zero on a vertical number line and provides examples of elevations both above and below sea level. The tutorial highlights common mistakes, such as using both negative numbers and the phrase 'below sea level' simultaneously. Real-world examples, like Death Valley, are used to illustrate these concepts.

What is a common mistake when writing elevations below sea level?

• Using positive numbers for below sea level

• Using only the negative sign

• Using both negative sign and 'below sea level'

• Using only 'below sea level'

What does sea level represent in terms of elevation?

• The highest point on land

• Zero elevation

• The average depth of the ocean

• The base of a mountain

If a mountain's base is at 220 feet, what does this indicate?

• The mountain is 220 feet tall

• The mountain starts at sea level

• The mountain is underwater

• The base has its own elevation above sea level

How should you express an elevation of 5 feet below sea level?

• 5 feet above sea level

• Negative 5 feet

• 5 feet below sea level

• Both negative 5 feet and 5 feet below sea level

What is the correct way to describe a submarine at 400 feet below sea level?

• Negative 400 feet

• 400 feet above sea level

• 400 feet below sea level

• Both negative 400 feet and 400 feet below sea level

Which of the following is a place on land that is below sea level?

• The Grand Canyon

• Death Valley

• Mount Everest

• The Sahara Desert

What is the elevation of Death Valley in California?

• 282 feet above sea level

• Negative 282 feet

• 282 feet below sea level

• Both negative 282 feet and 282 feet below sea level

What concept did you learn about using positive and negative numbers?

• Counting objects

• Measuring temperature

• Describing elevations

• Calculating distances