Lesson 7 of 8 · Earth Systems
Lesson⭐ 30 XP🌋 Rock RealmThe Geologic Time Scale
Earth Systems.
🎯 Your mission
Master the concept. Use it tomorrow.
⚡ The twist
Today's mountain was yesterday's ocean floor.
Mind = Blown
🌋 There are 1,500 active volcanoes on Earth right now.
Make a hypothesis first
Guess: where will the water go first?
What You'll Learn
The geologic time scale divides Earth's 4.6-billion-year history into eons, eras, and periods. Scientists mark the boundaries using major events like mass extinctions and the appearance of new life forms recorded in the rocks.
Key Words
Tap a word to see its definition.
Steps
Look at the vocabulary words and write a definition for each in your own words.
Create a timeline of Earth's history on a 5-meter strip of paper. Place major events (first life, dinosaurs, ice ages, humans) at the correct scale.
Observe what happens and describe it in detail.
Record your observations in your science journal with measurements and descriptions.
Check Your Understanding
Question 1
1 of 3How do fossils form?
Where you see this in real life
Today's weather, tomorrow's beach, next century's coastline — all this.
Stretch Challenge
Try this in real life this week.
Look at the sky for 5 minutes and try to predict tomorrow's weather.
For the dinner table
“What's the slowest change you can think of?”
Next Smart Experiment
We'll pick an experiment that matches exactly how you're thinking right now.
Share this experiment
Send it to a parent who's looking for a 10-minute kitchen science win.
Ready?
The Geologic Time Scale
Master the concept. Use it tomorrow.
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