Grade 2 | SCIENCE
WEEK 11 • PRACTICE WORKBOOK • DAYS 51–55
Read the matching lesson in the Week 11 Student Textbook first. Write each answer on the line below its question. Day 55 is answered on your own.
Fillable Practice PDF: Open or download Week 11 fillable workbook. Type in the answer fields and save the completed copy. Clock hands and other drawings may be completed on the printed page.
Week 11 Student Textbook | Week 11 Practice Workbook | Week 11 Teacher Guide | Week 10 Student Textbook | Week 12 Student Textbook | Grade 2 index
Day 51: Earth’s Surface Changes
Changes to the land
| Change | What causes it |
|---|---|
| A rock cracks into pieces | Water freezes in a crack and pushes the rock apart |
| Soil washes off a hill | Heavy rain |
| Sand piles up into a hill | Wind blows the sand |
| A riverbank wears away | Moving river water |
- What causes soil to wash off a hill?
Answer: _________________________________________________
- Which change in the table is weathering, not erosion?
Answer: _________________________________________________
- Choose one change from the table. Explain whether it moves rock or soil to a new place, and what that tells you about the change.
Answer: _________________________________________________
_____________________________________________
Day 52: Slow Changes
Riverbank measurements
| Year | Distance from the fence to the riverbank |
|---|---|
| Year 1 | 20 feet |
| Year 2 | 19 feet |
| Year 3 | 18 feet |
| Year 4 | 17 feet |
- How many feet did the riverbank wear away from Year 1 to Year 4?
Answer: _________________________________________________
- How many feet did it wear away each year?
Answer: _________________________________________________
- Explain how the table gives evidence that the riverbank is changing slowly.
Answer: _________________________________________________
_____________________________________________
Day 53: Fast Changes
How long each event takes
| Event | How long it takes |
|---|---|
| Earthquake | Seconds to minutes |
| Landslide | Minutes |
| Flood | Hours to days |
| River carving a canyon | Millions of years |
- Which event in the table happens in seconds to minutes?
Answer: _________________________________________________
- Which event takes the longest?
Answer: _________________________________________________
- Use the table and the Mount St. Helens report to explain why a volcano eruption is a fast change.
Answer: _________________________________________________
_____________________________________________
Day 54: Model Slow and Fast Changes
Sample results
| Hill | Height before | Height after | What we saw |
|---|---|---|---|
| A, slow | 6 inches | 5 inches | Small grooves |
| B, fast | 6 inches | 3 inches | Deep groove, sand spread out |
- How many inches shorter did Hill B become?
Answer: _________________________________________________
- Which hill changed more?
Answer: _________________________________________________
- Explain how this model is like the difference between a gentle rain and a flood.
Answer: _________________________________________________
_____________________________________________
Hands-on task: Model slow and fast water on sand hills
- On a tray with sides, build two sand hills the same size from damp sand. Measure each hill’s height with a ruler.
- Hill A, slow: poke 3 small holes in the bottom of a paper cup. Hold the cup over Hill A and let 1 cup of water drip out slowly.
- Hill B, fast: pour 1 cup of water onto Hill B all at once.
- Measure each hill’s height again. Look for grooves and for sand at the bottom of each hill.
- Record your results in the table below.
| Hill | Height before | Height after | What I saw |
|---|---|---|---|
| A, slow | ____ | ____ | __________ |
| B, fast | ____ | ____ | __________ |
My evidence that fast water changes the land more:
_________________________________________________
_____________________________________________
Day 55: Independent Check: Slow and Fast Changes
Two changes
| Change | Time it took |
|---|---|
| A landslide covers a road | About 10 minutes |
| A creek widens its banks by 4 feet | 40 years |
Answer on your own. An adult may read the questions aloud but should not give the answers.
- Which change in the table is a fast change?
Answer: _________________________________________________
- Wind blows sand from a beach into a dune. Is this weathering or erosion?
Answer: _________________________________________________
- Is the creek change slow or fast? Explain using evidence from the table.
Answer: _________________________________________________
_____________________________________________
Week 11 Student Textbook | Week 11 Practice Workbook | Week 11 Teacher Guide | Week 10 Student Textbook | Week 12 Student Textbook | Grade 2 index