What is the importance of scaling?
Scaling helps to put things into perspective. For example a map is often shown as something small, but it can be compared to as 1 inch equals 10 feet. The number 18,900 written in scientific notation is____On a computer, the "times ten to the power of" in scientific notation is written using an "e".
What are we allowed to do in science?
In science, we are only allowed to make use of observations that are made with our own eyes. Nice work! You just studied 103 terms! Now up your study game with Learn mode.
Can science be used to accurately investigate events that happened long ago?
Science cannot be used to accurately investigate events that happened long ago. Which of the following are components of fair testing of ideas? Mark all that apply. What constitutes an "appropriate" sample size is determined by the degree to which you wish to be able to distinguish between similar results.
Why do scientists use scientific notation?
In 10 words or more, why do scientists use scientific notation? Scaling helps to put things into perspective. For example a map is often shown as something small, but it can be compared to as 1 inch equals 10 feet.
Evaluating Prior Knowledge
Lesson Summary
- The Earth is very old, and the study of Earth's past requires us to think about times that were millions or even billions of years ago. Scientists use the geologic time scale to illustrate the orde...
- The geologic time scale was developed after scientists observed changes in the fossils going from oldest to youngest sedimentary rocks. They used relative dating to divide Earth's past i…
- The Earth is very old, and the study of Earth's past requires us to think about times that were millions or even billions of years ago. Scientists use the geologic time scale to illustrate the orde...
- The geologic time scale was developed after scientists observed changes in the fossils going from oldest to youngest sedimentary rocks. They used relative dating to divide Earth's past in several c...
- Later, scientists used absolute dating to determine the actual number of years ago that events happened. The geologic time scale is divided into eons, eras, periods, and epochs.
Review Questions
- How old is the Earth?
- Why did early geologic time scales not include the number of years ago that events happened?
- Dinosaurs went extinct about 66 million years ago. Which period of geologic time was the last in which dinosaurs lived?
- Can scientists use the same principles they use to study Earth’s history to also study the hist…
- How old is the Earth?
- Why did early geologic time scales not include the number of years ago that events happened?
- Dinosaurs went extinct about 66 million years ago. Which period of geologic time was the last in which dinosaurs lived?
- Can scientists use the same principles they use to study Earth’s history to also study the history of other planets?
Vocabulary
- absolute dating
1. Methods used to determine how long ago something happened. - extinction
1. When an organism completely dies out.
Points to Consider
- How did life on Earth change from one period of geologic time to the next?
- When did life first appear on Earth?
- What conditions were necessary on Earth for living things to survive?
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