Fossils Reveal Past Environments
Fossils Reveal Past Environments is a Grade 4 science skill from Amplify Science California Chapter 2 on past environments at Desert Rocks National Park. Students learn that the combination of rock type and fossils in a layer tells a complete environmental story: shells and fish fossils indicate ancient ocean or lake, while leaf and land animal fossils indicate dry land.
Key Concepts
When studying a rock layer, the specific combination of rock type and fossils tells a complete story. If a rock layer contains fossils of shells or fish, it provides strong evidence that the location was once an ocean or lake.
If a layer contains fossils of leaves or land animals, it indicates the area was dry land. These clues allow scientists to map how the environment of a specific location has changed over millions of years.
Common Questions
How do fossils reveal past environments?
The type of fossils found in a rock layer indicates what organisms lived there. Marine fossils indicate ancient oceans; land plant fossils indicate dry environments.
What do shell and fish fossils in rock tell us?
Shell and fish fossils are strong evidence that the location was once covered by an ocean or large lake, even if it is now dry land.
How do scientists use rock and fossils together?
Rock type tells about the sediment environment and fossils confirm what organisms lived there. Together they paint a complete picture of the past environment.
Where is this in Amplify Science Grade 4?
It is in Chapter 2: What was the environment of Desert Rocks National Park like in the past? in Amplify Science California Grade 4.