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Geologic Time Calculations part of Quantitative Skills:Activity Collection
Francisco San Juan, Elizabeth City State University
Radiometric age determination using parent/daughter composition and a radiometric decay curve.

Reading Topographic Maps and Calculating Map Scale part of Quantitative Skills:Activity Collection
Leslie Kanat, Johnson State College
Use a topographic map to deliniate a watershed, draw a map bar scale, and calculate a map ratio scale.

Machines that change climate: Porsche 911 Turbo vs. Toyota Prius part of Quantitative Skills:Activity Collection
Kevin Harrison, McDaniel College
This problem illustrates how consumer decisions can influence carbon dioxide levels in the atmosphere, how to make back-of-the-envelope calculations, and demonstrates the power of exponential growth.

Back-of-the-Envelope Calculations: Earth History Timeline part of Quantitative Skills:Activity Collection
Barb Tewksbury, Hamilton College
Question The Earth is about 4.6 billion years old. Let's try to get a perspective on how long that really is. A roll of good quality toilet paper has 1000 squares. If the roll of toilet paper represents the ...

Back-of-the-Envelope Calculations: Energy Released in an Earthquake part of Quantitative Skills:Activity Collection
Barb Tewksbury, Hamilton College
Question A magnitude 8.5 earthquake (such as the 1964 Good Friday earthquake in Alaska) releases about 1x1018 joules of energy. The atomic bomb exploded over Hiroshima released about 1.5x1013 joules of energy. How ...

Back-of-the-Envelope Calculations: Age of the Earth part of Quantitative Skills:Activity Collection
Barb Tewksbury, Hamilton College
Question The Earth is about 4.6 billion years old. Let's try to get a perspective on how long that really is. Suppose that you decided to count to 4.6 billion and that you counted 1 number every second. How ...

Back-of-the-Envelope Calculations: Approaching Asteroid part of Quantitative Skills:Activity Collection
Barb Tewksbury, Hamilton College
Question If asteroids careen through the solar system at 25 km/second, how far away would we have to detect one in order to have a year's notice to prepare for an impact, as was portrayed in the movie Deep ...

Back-of-the-Envelope Calculations: Rate of Lava Flow part of Quantitative Skills:Activity Collection
Barb Tewksbury, Hamilton College
Question In 1983, an eruption began at Kilauea Volcano in Hawaii that has proved to be the largest and longest-lived eruption since records began in 1823. Lava has poured out of the volcano at an average rate of ...

Back-of-the-Envelope Calculations: Collision with Asteroid part of Quantitative Skills:Activity Collection
Barb Tewksbury, Hamilton College
Question We have located an asteroid heading directly for the Earth. It is now 1.6 million km away from the Earth, about 4 times the distance from the Earth to the Moon. The asteroid is travelling at 25 km/second. ...

Back-of-the-Envelope Calculations: Percentage of Copper in Ore part of Quantitative Skills:Activity Collection
Barb Tewksbury, Hamilton College
Question Suppose that you are building a new house. It will take about 90 kg (198 pounds) of copper to do the electrical wiring. In order to get the copper in the first place, someone needs to mine solid rock that ...



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