4th grade · Science · Unit 8 of 10
Rock Layers & Erosion
Weathering, erosion and what rock layers tell us.
What your child practices
Practices how water, ice, wind and plants break down and move rock, and how patterns in rock layers and fossils show how a landscape changed over time.
California Content Standards learning standard: 4-ESS1-1; 4-ESS2-1 · rock layers and fossils show landscape change, and weathering and erosion shape the land
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
Sand dunes are shaped by…
- earthquakes
- glaciers
- wind
- lava
wind
Hint: Wind piles up sand.
Question 2
Rounded river rocks got smooth because…
- they were painted
- water tumbled them
- wind sanded them in a day
- they melted
water tumbled them
Hint: Rocks bump and wear.
Question 3
Which moves rock and soil the most in a river valley?
- Running water
- Sunlight
- Sound
- Moonlight
Running water
Hint: Rivers carry sediment.
Question 4
In rock layers, the oldest layer is usually at the…
- side
- middle always
- top
- bottom
bottom
Hint: Layers stack up over time.
Question 5
A river carved the Grand Canyon by…
- wind only
- erosion over a very long time
- one big flood in a day
- an earthquake
erosion over a very long time
Hint: Slow erosion.
Question 6
A fossil of a land plant is found above a layer of fish fossils. The plant fossil is…
- older
- the same age
- younger
- not a fossil
younger
Hint: Higher is younger.