Scientific thinking changes based on new information and technology.
Before watching the video below to learn more about how scientists determined the age of the Earth, make a prediction: How old is the Earth?
Scientists use models to help visualize something that may be difficult to understand.
What tools can be used to create models?
Models can change as new information and technology become available.
Below are 2 models.
The Ancient Greeks developed the model, which placed the at the center of the solar system.
However based on his observations, Copernicus proposed the model, which placed the at the center of the solar system.
This image is a model of a negative feedback loop here on Earth (and Daisyworld).
Why is this considered a negative feedback loop?
Consider this model of a positive feedback loop briefly mentioned at the end of the Daisyworld video.
Determine the effects of polar ice caps melting.
Why is the previous model of melting ice considered a positive feedback loop?
Self Assessment: Rate your mastery of each learning target.
1 - I need help! | 2 | 3 | 4 | 5 - I could teach this to another student | |
|---|---|---|---|---|---|
Learning Target #1: Describe the use of models in science and how they can change | |||||
Learning Target #2: Define negative and positive feedback loops and explain how they are different |
Scientists frequently use (found in zircon crystals) in radiometric dating, which decays into
Scientists used radiometric dating on
When the planet is cool, daisies grow, absorb the Sun's energy, and cause temperatures to .
When the planet is warm, daisies grow, reflect the Sun's energy, and cause temperatures to
The albedo of a mirror would be
Which type of feedback loop does Daisyworld represent?
What functions similar to the white daisies and reflects sunlight here on Earth?
